Fix: KeyError in XmlMetaBuilder.build_class_meta for certain packages

[jootten]

Description

For certain packages installed alongside xsdata entries in sys.modules are missing for classes from those packages. This leads to a KeyError when trying to get the module.

One of the nvidia packages pytorch depends on leads to this error for me. I dont know which one exactly.

Trace:

   return XmlParser().from_bytes(raw, cvat_xml.Annotations)
  File "/code/.venv/lib/python3.10/site-packages/xsdata/formats/dataclass/parsers/mixins.py", line 88, in from_bytes
    return self.parse(io.BytesIO(source), clazz, ns_map)
  File "/code/.venv/lib/python3.10/site-packages/xsdata/formats/dataclass/parsers/bases.py", line 58, in parse
    result = handler.parse(source, ns_map)
  File "/code/.venv/lib/python3.10/site-packages/xsdata/formats/dataclass/parsers/handlers/lxml.py", line 42, in parse
    return self.process_context(ctx, ns_map)
  File "/code/.venv/lib/python3.10/site-packages/xsdata/formats/dataclass/parsers/handlers/lxml.py", line 60, in process_context
    self.parser.start(
  File "/code/.venv/lib/python3.10/site-packages/xsdata/formats/dataclass/parsers/bases.py", line 94, in start
    child = item.child(qname, attrs, ns_map, len(objects))
  File "/code/.venv/lib/python3.10/site-packages/xsdata/formats/dataclass/parsers/nodes/element.py", line 459, in child
    node = self.build_node(qname, var, attrs, ns_map, position)
  File "/code/.venv/lib/python3.10/site-packages/xsdata/formats/dataclass/parsers/nodes/element.py", line 559, in build_node
    clazz = self.context.find_type(qname)
  File "/code/.venv/lib/python3.10/site-packages/xsdata/formats/dataclass/context.py", line 168, in find_type
    types: list[type] = self.find_types(qname)
  File "/code/.venv/lib/python3.10/site-packages/xsdata/formats/dataclass/context.py", line 153, in find_types
    self.build_xsi_cache()
  File "/code/.venv/lib/python3.10/site-packages/xsdata/formats/dataclass/context.py", line 112, in build_xsi_cache
    meta = builder.build_class_meta(clazz)
  File "/code/.venv/lib/python3.10/site-packages/xsdata/formats/dataclass/models/builders.py", line 248, in build_class_meta
    module = sys.modules[clazz.__module__]
KeyError: ''

🔗 What I've Done

Added a simple check whether the clazz.module exists in sys.modules.

🛫 Checklist

I think there is no need to update docs or tests for this small fix.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.94%. Comparing base (2512c1f) to head (22f236b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1144   +/-   ##
=======================================
  Coverage   99.94%   99.94%           
=======================================
  Files         116      116           
  Lines        9370     9370           
  Branches     1430     1430           
=======================================
  Hits         9365     9365           
  Misses          5        5           

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[tefra]

Let's add this to the rest of the exceptions here please

https://github.com/tefra/xsdata/blob/main/xsdata/formats/dataclass/context.py#L135

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[tefra]

Thanks @jootten