F improve error messages

Summary

Part of https://gitlab.indiscale.com/caosdb/customers/geomar/management/-/issues/298. Fixes a problem whereby ImpossibleMergeErrors didn't contain sufficient information.

Focus

Is the new error message understandable?

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)
• Up-to-date JSON schema (or not necessary)
• Appropriate user and developer documentation (or not necessary)
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• Annotations in code (Gitlab comments)
  • Intent of new 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
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src/caoscrawler/crawl.py

@@ -64,6 +64,7 @@ from linkahead.utils.escape import escape_squoted_text
 from .config import get_config_setting
 from .converters import Converter, ConverterValidationError
 from .debug_tree import DebugTree
+from .exceptions import ImpossibleMergeError
 from .identifiable_adapters import (CaosDBIdentifiableAdapter,
                                     IdentifiableAdapter)
 from .logging import configure_server_side_logging
@@ -1114,6 +1115,14 @@ def crawler_main(crawled_directory_path: str,
         logger.error(err)
         _update_status_record(crawler.run_id, 0, 0, status="FAILED")
         return 1
+    except ImpossibleMergeError as err:
+        logger.debug(traceback.format_exc())
+        logger.error(
+            "Encountered conflicting information when creating Records from the crawled "
+            f"data:\n\n{err}"
+        )
+        _update_status_record(crawler.run_id, 0, 0, status="FAILED")
+        return 1
     except TransactionError as err:
         logger.debug(traceback.format_exc())
         logger.error(err)