Add further debug output and fallback mimetpye check

tests/test_uploads.py

@@ -113,8 +113,12 @@ def _assert_file_is_uploaded_and_extracted_where_required(self, test_archive_fil
         self.assertNotContains(response, "is not a plain text file")
         self.assertEqual(Upload.objects.all().count(), previous_upload_count + 1)
         uploaded_file_path = Upload.objects.all().order_by("id").last().abstracts_upload.path
-        logger.error(f"uploaded_file_path {uploaded_file_path}")
         mime_type = magic.from_file(uploaded_file_path, mime=True)
+        if mime_type == None:
+            logger.error(f"uploaded_file_path {uploaded_file_path}")
+            logger.error(self.driver.page_source)
+            uploaded_file = Upload.objects.all().order_by("id").last().abstracts_upload.file
+            mime_type = magic.from_buffer(uploaded_file.read(1024), mime=True)
         self.assertEqual(mime_type, "text/plain")
 
     def test_bz2_pub_med_upload_is_allowable(self):