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
@@ -375,6 +378,10 @@ class Converter(object, metaclass=ABCMeta):
         The `type` key in the `definition` defines the Converter class which is being used.
         """
 
+        if definition is None:
+            raise RuntimeError("Definition of converter \"{}\" is "
+                               "empty".format(name))
+
         if "type" not in definition:
             raise RuntimeError(
                 "Type is mandatory for converter entries in CFood definition.")