mergeFolder getString IllegalStateException

## Current use version？
#### 当前使用的版本是多少？

```
v3.11.2
```

## Will this problem occur in demo?
#### Demo能否复现这问题？

```
firebase后台上报
```

## Describe the problem or provide an error log？
#### 描述问题或提供错误log？

```
Exception java.lang.IllegalStateException:
at androidx.fragment.app.Fragment.requireContext (Fragment.java:919)
at androidx.fragment.app.Fragment.getResources (Fragment.java)
at androidx.fragment.app.Fragment.getString (Fragment.java:1005)
at com.luck.picture.lib.PictureSelectorFragment.mergeFolder (PictureSelectorFragment.java:1190)
at com.luck.picture.lib.PictureSelectorFragment.dispatchCameraMediaResult (PictureSelectorFragment.java:1167)
at com.luck.picture.lib.basic.PictureCommonFragment$9.onSuccess (PictureCommonFragment.java:1171)
at com.luck.picture.lib.basic.PictureCommonFragment$9.onSuccess (PictureCommonFragment.java:1147)
at com.luck.picture.lib.thread.PictureThreadUtils$Task$3.run (PictureThreadUtils.java:1237)
at android.os.Handler.handleCallback (Handler.java:938)
at android.os.Handler.dispatchMessage (Handler.java:99)
at android.os.Looper.loopOnce (Looper.java:201)
at android.os.Looper.loop (Looper.java:288)
at android.app.ActivityThread.main (ActivityThread.java:7881)
at java.lang.reflect.Method.invoke
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:568)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1045)
```

Start by inspecting mergeFolder in PictureSelectorFragment.java around line 1190 and the call from dispatchCameraMediaResult around line 1167. Trace the asynchronous success callback shown in the stack trace and reproduce the Firebase-reported crash if possible; done means this IllegalStateException no longer occurs in that flow.

Written by the indexing model from the issue text.