Merge pull request #2 from sverrirab/fix_keyerror

Fix bug #1 in Tokenizer library

Author: vthorsteinsson

src/tokenizer/tokenizer.py

@@ -588,7 +588,7 @@ def lookup(abbrev):
         m = Abbreviations.DICT.get(abbrev)
         if m is not None:
             return [ m ]
-        m = Abbreviations.DICT[abbrev.lower()]
+        m = Abbreviations.DICT.get(abbrev.lower())
         return None if m is None else [ m ]
 
     token = None