Errhandling non dict values (#3463)

* Update CHANGELOG.md

* test database contains command_parameters columns in qiita.processing_job with values "", which is not a dict and also not None

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Co-authored-by: Antonio Gonzalez <[email protected]>

Author: sjanssen2

qiita_db/software.py

@@ -1620,6 +1620,11 @@ def load(cls, command, json_str=None, values_dict=None):
             error_msg = ("The provided JSON string doesn't encode a "
                          "parameter set for command %s" % command.id)
         else:
+            if not isinstance(values_dict, dict):
+                raise qdb.exceptions.QiitaDBError(
+                    "The provided value_dict is %s (i.e. not None) but also "
+                    "not a dictionary for command %s" % (
+                        values_dict, command.id))
             parameters = deepcopy(values_dict)
             error_msg = ("The provided values dictionary doesn't encode a "
                          "parameter set for command %s" % command.id)