Better error message

Summary

This very small MR just adds two more verbose error messages for two mistakes that can appear during cfood development.

Please see the in-code comments for details.

Test Environment

There are unit tests.

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src/caoscrawler/converters/converters.py

@@ -268,6 +268,9 @@ def create_records(values: GeneralStore, records: RecordStore, def_records: dict
 
         c_record = records[name]
 
+        if isinstance(record, str):
+            raise RuntimeError(
+                "dict expected, but found str: {}".format(record))
         for key, value in record.items():
             if key == "parents" or key == "role":
                 continue