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|  | git://github.com/brandoncazander/django-rest-framework into brandoncazander-version-3.1-2489 | 
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|  | Conflicts:
	rest_framework/serializers.py | 
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|  | ManyRelatedField.get_value clearing field on partial update | 
|  | Use the proper db_table argument when constructing meta | 
|  | Reload api_settings when using Django's 'override_settings' | 
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|  | A PATCH to a serializer's non-related CharField was clearing an ancillary StringRelatedField(many=True) field.
The issue appears to be in the ManyRelatedField's get_value method, which was returning a [] instead of empty
when the request data was a MultiDict.
This fix mirrors code in fields.py, class Field, get_value, Ln. 272, which explicitly returns empty on a partial update.
Tests added to demonstrate the issue. | 
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|  | methods. Fixes #2455 | 
|  | Pass {} as data to DataAndFiles, as it ends up in a MergeDict | 
|  | In the same vein as #2399. | 
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|  | CursorPagination | 
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