F merge missing list datatype

Summary

For #151 (closed). Does not fix the actual problem because this is a CloseWon't Fix (or has to be fixed in the crawler) but raises a better error message instead.

Focus

Check that the correct error message is shown.

Test Environment

Unit tests should be sufficient.

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• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
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Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
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src/caosdb/apiutils.py

@@ -442,16 +442,6 @@ def merge_entities(entity_a: Entity, entity_b: Entity, merge_references_with_emp
                         setattr(entity_a.get_property(key), attribute,
                                 diff_r2["properties"][key][attribute])
                     elif force:
-                        if attribute == "value":
-                            # Very special case of a property that has a scalar
-                            # datatype being fored to a list value without
-                            # having been assigned the correct datatype before.
-                            if isinstance(diff_r2["properties"][key][attribute], list):
-                                if ((entity_a.get_property(key).datatype is not None) and
-                                        (not entity_a.get_property(key).datatype.startswith("LIST<"))):
-                                    entity_a.get_property(key).datatype = LIST(
-                                        entity_a.get_property(key).datatype)
-
                         setattr(entity_a.get_property(key), attribute,
                                 diff_r2["properties"][key][attribute])
                     else: