OfflineContentManager export_items fails for "Table (hosted)" feature service
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- Python
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Description
**Describe the bug**
When using OfflineContentManager's export_items method, it fails unexpectedly for a "Table (hosted)" feature service. (See error message below.)
**To Reproduce**
1. Create a Table (hosted) either by uploading a simple CSV file or via Content --> New item.
2. Attempting to make an offline backup of the item using export_items produces the following error:
```python
C:\Users\knoop\AppData\Local\ESRI\conda\envs\work\Lib\site-packages\arcgis\apps\itemgraph\_migration.py:149: RuntimeWarning: Failed to export item b570d7c8577042d891d4eb09d348f331 due to error: is not JSON serializable. Deleting folder and skipping...
warnings.warn(
```
The above error message looks to have truncated prematurely as well.
**Expected behavior**
I expect export_items to be able to successfully export a "Table (hosted)" feature service.
**Platform (please complete the following information):**
Python API version 2.4.2
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