models.py::_parse_value fails for some list-valued content

Summary

Somehow, sometimes _parse_value fails, when it unexpectedly gets list-like content.

Expected Behavior

Should not fail.

Actual Behavior

In [17]: db.execute_query("FIND Record")
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-17-6030f7c12a1e> in <module>
----> 1 db.execute_query("FIND Record")

~/.local/lib/python3.9/site-packages/caosdb/common/models.py in execute_query(q, unique, raise_exception_on_error, cache, flags)
   4055         query.flags = flags
   4056
-> 4057     return query.execute(unique=unique,
   4058                          raise_exception_on_error=raise_exception_on_error,
   4059                          cache=cache)

~/.local/lib/python3.9/site-packages/caosdb/common/models.py in execute(self, unique, raise_exception_on_error, cache)
   3992             entity_uri_segments=["Entity"],
   3993             query_dict=query_dict)
-> 3994         cresp = Container._response_to_entities(http_response)
   3995         self.results = cresp.query.results
   3996         self.cached = cresp.query.cached

~/.local/lib/python3.9/site-packages/caosdb/common/models.py in _response_to_entities(http_response)
   2726
   2727             for child in xml:
-> 2728                 e = _parse_single_xml_element(child)
   2729
   2730                 if isinstance(e, Message):

~/.local/lib/python3.9/site-packages/caosdb/common/models.py in _parse_single_xml_element(elem)
   4222         klass = classmap.get(elem.tag.lower())
   4223         entity = klass()
-> 4224         Entity._from_xml(entity, elem)
   4225
   4226         return entity

~/.local/lib/python3.9/site-packages/caosdb/common/models.py in _from_xml(entity, elem)
    999         for celem in elem:
   1000
-> 1001             child = _parse_single_xml_element(celem)
   1002
   1003             if isinstance(child, Property):

~/.local/lib/python3.9/site-packages/caosdb/common/models.py in _parse_single_xml_element(elem)
   4222         klass = classmap.get(elem.tag.lower())
   4223         entity = klass()
-> 4224         Entity._from_xml(entity, elem)
   4225
   4226         return entity

~/.local/lib/python3.9/site-packages/caosdb/common/models.py in _from_xml(entity, elem)
   1036
   1037         try:
-> 1038             entity.value = value
   1039         except ValueError:
   1040             # circumvent the parsing.

~/.local/lib/python3.9/site-packages/caosdb/common/models.py in value(self, new_value)
    222     @value.setter
    223     def value(self, new_value):
--> 224         self.__value = _parse_value(self.datatype, new_value)
    225
    226     @property

~/.local/lib/python3.9/site-packages/caosdb/common/models.py in _parse_value(datatype, value)
   1262         # for unversioned references
   1263         try:
-> 1264             return int(value)
   1265         except ValueError:
   1266             # reference via name

TypeError: int() argument must be a string, a bytes-like object or a number, not 'list'

Steps to Reproduce the Problem

TODO

Specifications

• Version: 0.6.0, 0.7.0 and 0.7.1.dev0+234bd386 all show this behaviour.
• Platform: Python 3.9 on Debian.

Possible fixes

• Handle lists?