fix(projekt-matching): retry chat_json on empty/unparseable vLLM completion

projekt-matching/tests/test_llm.py

@@ -35,6 +35,20 @@ def test_chat_json_strips_markdown_fences():
     assert out == {"a": 2}
 
 
+def test_chat_json_retries_on_empty_content():
+    good = json.dumps({"a": 1})
+    with mock.patch("projektmatch.llm.time.sleep", lambda s: None), \
+         mock.patch("projektmatch.llm.requests.post", fake_post(["", good])):
+        assert llm.chat_json("http://v/v1", "m", [], {"type": "object"}) == {"a": 1}
+
+
+def test_chat_json_raises_after_exhausted_retries():
+    with mock.patch("projektmatch.llm.time.sleep", lambda s: None), \
+         mock.patch("projektmatch.llm.requests.post", fake_post(["", "", ""])):
+        with pytest.raises(llm.LlmError, match="kein JSON"):
+            llm.chat_json("http://v/v1", "m", [], {"type": "object"})
+
+
 def test_match_cv_retries_on_missing_nr_then_raises():
     reqs = [{"nr": 1, "text": "Python"}, {"nr": 2, "text": "K8s"}]
     partial = json.dumps({"ratings": [