skip if none

algo.py

@@ -230,6 +230,12 @@ class Algo:
     def handle_single_item(self, input_word):
         input_word_clean = clean_word(input_word)
 
+        if not input_word_clean:
+            return None
+
+        if input_word_clean == "":
+            return None
+
         # try the singular form of the word
         singular = self.pluralizer.pluralize(input_word_clean, 1)
         mapping = get_mapping_from_db(self.db_cursor, singular)