FIX CI

Summary

There were multiple problems that lead to a pipeline crash. The main issue was that entities were multiple times in the exported xml file.

Test Environment

CI/unittest should be fine.

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• All automated tests pass
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  • Problems with old code
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• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md
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integrationtests/test_im_und_export.py

@@ -15,7 +15,6 @@ if __name__ == "__main__":
     # delete everything
     recs = db.execute_query("FIND entity with id>99")
     recs.delete()
-    print(db.execute_query("FIND FILE"))
     assert 0 == len(db.execute_query("FIND File which is stored at "
                                      "**/poster.pdf"))
     import_xml(os.path.join(directory.name, "caosdb_data.xml"), interactive=False)