New f fix merge

Summary

Continuation of !120 (merged) that was weirdly merged, later reverted. this MR is still lacking documentation and explanation, esp. regarding the pending list. See #108 (closed).

After a closer look, this was actually the second half of the fix for #113 (closed). We postpone the merging of entities in case of unresolved reference properties.

Focus

The problem that is being solved is best described in the new integration test originally from !141 (merged). It describes the case of three records, an event, a basis, and a campaign. Both, event and campaign reference the basis, and event references campaign. Campaign and basis already exist on the server.

This is solved by postponing the merge, and by the new merge_id_with_resolved_entity argument of merge_entities.

Test Environment

New integration test should be sufficient.

Check List for the Author

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• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Up-to-date JSON schema (or not necessary)
• Appropriate user and developer documentation (or not necessary)
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  • 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)
• Appropriate user and developer documentation (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

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src/caoscrawler/crawl.py

@@ -298,7 +298,7 @@ class Crawler(object):
 
     def _has_reference_value_without_id(self, ident: Identifiable) -> bool:
         """
-        Returns True if there is at least one value in the properties and backrefs attributes of ``ident`` which:
+        Returns True if there is at least one value in the properties attribute of ``ident`` which:
 
         a) is a reference property AND
         b) where the value is set to a