FIX: Ignore obligatory properties when inserting identifiables

Summary

See #40 (closed).

Focus

Added a flag in the insertion of identifiables in crawler.py. Also repaired the integration test for datamodel problems.

Test Environment

Integration tests should be sufficient.

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integrationtests/test_crawl_with_datamodel_problems.py

@@ -89,5 +89,6 @@ def test_crawler_with_data_model_problems():
 
     # There should be datamodel problems
     assert len(DataModelProblems.missing) > 0
+
     # Deleted entities should have been identified:
-    assert deleted_entities.issubset(DataModelProblems.missing)
+    assert DataModelProblems.missing.issubset(deleted_entities)