test(reindex): cover empty-text raise path (FU-3 review)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

mcp-server/tests/test_reindex_on_change.py

@@ -80,3 +80,10 @@ def test_reindex_case_law_missing_row_raises(monkeypatch):
     monkeypatch.setattr(ingest.db, "get_case_law", _none)
     with pytest.raises(ValueError, match="not found"):
         _run(ingest.reindex_case_law(uuid4()))
+
+
+def test_reindex_case_law_empty_text_raises(monkeypatch):
+    async def _empty(x): return {"id": uuid4(), "full_text": "   "}
+    monkeypatch.setattr(ingest.db, "get_case_law", _empty)
+    with pytest.raises(ValueError, match="no stored full_text"):
+        _run(ingest.reindex_case_law(uuid4()))