Fix: Catch new warning when loading the classifier (#5395)

src/documents/tests/test_classifier.py

@@ -1,5 +1,6 @@
 import os
 import re
+import shutil
 from pathlib import Path
 from unittest import mock
 
@@ -649,7 +650,7 @@ class TestClassifier(DirectoriesMixin, TestCase):
         Path(settings.MODEL_FILE).touch()
         self.assertTrue(os.path.exists(settings.MODEL_FILE))
 
-        load.side_effect = IncompatibleClassifierVersionError()
+        load.side_effect = IncompatibleClassifierVersionError("Dummey Error")
         self.assertIsNone(load_classifier())
         self.assertFalse(os.path.exists(settings.MODEL_FILE))
 
@@ -661,3 +662,14 @@ class TestClassifier(DirectoriesMixin, TestCase):
         load.side_effect = OSError()
         self.assertIsNone(load_classifier())
         self.assertTrue(os.path.exists(settings.MODEL_FILE))
+
+    def test_load_old_classifier_version(self):
+        shutil.copy(
+            os.path.join(os.path.dirname(__file__), "data", "v1.17.4.model.pickle"),
+            self.dirs.scratch_dir,
+        )
+        with override_settings(
+            MODEL_FILE=self.dirs.scratch_dir / "v1.17.4.model.pickle",
+        ):
+            classifier = load_classifier()
+            self.assertIsNone(classifier)