AirTestIDE中调用snapshot(filename='endTest', msg="airtest")报错了

代码:
```
from airtest.core.api import *

auto_setup(__file__)

snapshot(filename='endTest', msg="airtest")
```
错误日志：
```
[16:58:09][DEBUG] [minicap_server]b'INFO: (external/MY_minicap/src/minicap_29.cpp:255) Creating virtual display'
[16:58:09][DEBUG] [minicap_server]b'INFO: (external/MY_minicap/src/minicap_29.cpp:261) Creating buffer queue'
[16:58:09][DEBUG] [minicap_server]b'INFO: (external/MY_minicap/src/minicap_29.cpp:264) Setting buffer options'
[16:58:09][DEBUG] [minicap_server]b'INFO: (external/MY_minicap/src/minicap_29.cpp:268) Creating CPU consumer'
[16:58:09][DEBUG] [minicap_server]b'INFO: (external/MY_minicap/src/minicap_29.cpp:272) Creating frame waiter'
[16:58:09][DEBUG] [minicap_server]b'INFO: (external/MY_minicap/src/minicap_29.cpp:276) Publishing virtual display'
[16:58:09][DEBUG] [minicap_server]b'INFO: (jni/minicap/JpgEncoder.cpp:64) Allocating 7678980 bytes for JPG encoder'
[16:58:09][DEBUG] [minicap_server]b'INFO: (jni/minicap/minicap.cpp:489) Server start'
[16:58:09][DEBUG] (1, 24, 4956, 1080, 2340, 1080, 2340, 0, 2)
[16:58:09][DEBUG] [minicap_server]b'INFO: (jni/minicap/minicap.cpp:492) New client connection'
[16:58:10][ERROR] Traceback (most recent call last):
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\PIL\Image.py", line 2543, in save
format = EXTENSION[ext]
KeyError: ''

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\airtest\cli\runner.py", line 72, in runTest
exec(compile(code.encode("utf-8"), pyfilepath, 'exec'), self.scope)
File "C:\Users\lyyd\Desktop\airtest_demo.air\airtest_demo.py", line 13, in
snapshot(filename='endTest', msg="airtest")
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\airtest\utils\logwraper.py", line 131, in wrapper
res = f(*args, **kwargs)
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\airtest\core\api.py", line 295, in snapshot
screen = G.DEVICE.snapshot(filename, quality=quality, max_size=max_size)
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\airtest\core\android\android.py", line 490, in snapshot
aircv.imwrite(filename, screen, quality, max_size=max_size)
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\airtest\aircv\aircv.py", line 34, in imwrite
compress_image(pil_img, filename, quality, max_size=max_size)
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\airtest\aircv\utils.py", line 107, in compress_image
pil_img.save(path, quality=quality, optimize=True)
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\PIL\Image.py", line 2546, in save
raise ValueError(msg) from e
ValueError: unknown file extension:

custom tearDown
======================================================================
ERROR: runTest (__main__.CustomCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\PIL\Image.py", line 2543, in save
format = EXTENSION[ext]
KeyError: ''

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\airtest\cli\runner.py", line 75, in runTest
six.reraise(*sys.exc_info())
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\six.py", line 719, in reraise
raise value
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\airtest\cli\runner.py", line 72, in runTest
exec(compile(code.encode("utf-8"), pyfilepath, 'exec'), self.scope)
File "C:\Users\lyyd\Desktop\airtest_demo.air\airtest_demo.py", line 13, in
snapshot(filename='endTest', msg="airtest")
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\airtest\utils\logwraper.py", line 131, in wrapper
res = f(*args, **kwargs)
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\airtest\core\api.py", line 295, in snapshot
screen = G.DEVICE.snapshot(filename, quality=quality, max_size=max_size)
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\airtest\core\android\android.py", line 490, in snapshot
aircv.imwrite(filename, screen, quality, max_size=max_size)
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\airtest\aircv\aircv.py", line 34, in imwrite
compress_image(pil_img, filename, quality, max_size=max_size)
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\airtest\aircv\utils.py", line 107, in compress_image
pil_img.save(path, quality=quality, optimize=True)
File "C:\Users\lyyd\pyenv-win\pyenv-win\versions\3.8.5\lib\site-packages\PIL\Image.py", line 2546, in save
raise ValueError(msg) from e
ValueError: unknown file extension:

----------------------------------------------------------------------
Ran 1 test in 3.759s

FAILED (errors=1)
[16:58:10][DEBUG] C:\Users\lyyd\AppData\Local\Android\Sdk\platform-tools\adb.exe -P 5037 -s 75575fdc forward --remove tcp:16873
[16:58:10][DEBUG] [rotation_server]b''
[16:58:10][DEBUG] [minicap_server]b''
[16:58:10][DEBUG] C:\Users\lyyd\AppData\Local\Android\Sdk\platform-tools\adb.exe -P 5037 -s 75575fdc forward --remove tcp:16873
[16:58:10][DEBUG] minicap stream ends
[Finished]
```
实际情况：
```
截图可以正常保存到本地
```

运行日志：
```
{"tag": "function", "depth": 1, "time": 1723712287.0723295, "data": {"name": "connect_device", "call_args": {"uri": "android://127.0.0.1:5037/75575fdc?touch_method=MAXTOUCH&"}, "start_time": 1723712286.5688064, "ret": "", "end_time": 1723712287.0723295}}
{"tag": "function", "depth": 1, "time": 1723712290.0786386, "data": {"name": "snapshot", "call_args": {"filename": "endTest", "msg": "airtest", "quality": null, "max_size": null}, "start_time": 1723712287.0723295, "traceback": "Traceback (most recent call last):\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\PIL\\Image.py\", line 2543, in save\n format = EXTENSION[ext]\nKeyError: ''\n\nThe above exception was the direct cause of the following exception:\n\nTraceback (most recent call last):\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\airtest\\utils\\logwraper.py\", line 131, in wrapper\n res = f(*args, **kwargs)\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\airtest\\core\\api.py\", line 295, in snapshot\n screen = G.DEVICE.snapshot(filename, quality=quality, max_size=max_size)\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\airtest\\core\\android\\android.py\", line 490, in snapshot\n aircv.imwrite(filename, screen, quality, max_size=max_size)\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\airtest\\aircv\\aircv.py\", line 34, in imwrite\n compress_image(pil_img, filename, quality, max_size=max_size)\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\airtest\\aircv\\utils.py\", line 107, in compress_image\n pil_img.save(path, quality=quality, optimize=True)\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\PIL\\Image.py\", line 2546, in save\n raise ValueError(msg) from e\nValueError: unknown file extension: \n", "end_time": 1723712290.0786386}}
{"tag": "function", "depth": 2, "time": 1723712290.3102157, "data": {"name": "try_log_screen", "call_args": {"screen": null, "quality": null, "max_size": null}, "start_time": 1723712290.0786386, "ret": {"screen": "1723712290294.jpg", "resolution": [1080, 2340]}, "end_time": 1723712290.3102157}}
{"tag": "info", "depth": 1, "time": 1723712290.3102157, "data": {"name": "Final Error", "traceback": "Traceback (most recent call last):\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\PIL\\Image.py\", line 2543, in save\n format = EXTENSION[ext]\nKeyError: ''\n\nThe above exception was the direct cause of the following exception:\n\nTraceback (most recent call last):\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\airtest\\cli\\runner.py\", line 72, in runTest\n exec(compile(code.encode(\"utf-8\"), pyfilepath, 'exec'), self.scope)\n File \"C:\\Users\\lyyd\\Desktop\\airtest_demo.air\\airtest_demo.py\", line 13, in \n snapshot(filename='endTest', msg=\"airtest\")\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\airtest\\utils\\logwraper.py\", line 131, in wrapper\n res = f(*args, **kwargs)\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\airtest\\core\\api.py\", line 295, in snapshot\n screen = G.DEVICE.snapshot(filename, quality=quality, max_size=max_size)\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\airtest\\core\\android\\android.py\", line 490, in snapshot\n aircv.imwrite(filename, screen, quality, max_size=max_size)\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\airtest\\aircv\\aircv.py\", line 34, in imwrite\n compress_image(pil_img, filename, quality, max_size=max_size)\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\airtest\\aircv\\utils.py\", line 107, in compress_image\n pil_img.save(path, quality=quality, optimize=True)\n File \"C:\\Users\\lyyd\\pyenv-win\\pyenv-win\\versions\\3.8.5\\lib\\site-packages\\PIL\\Image.py\", line 2546, in save\n raise ValueError(msg) from e\nValueError: unknown file extension: \n"}}

```

如果`snapshot(filename='endTest', msg="airtest")` 不加filename参数，是可以正常运行的，加了以后就报错了

系统环境
```
Package Version
--------------------- -----------
airtest 1.3.4
pillow 10.4.0
pocoui 1.0.94
```