Update app.py

app.py

@@ -95,6 +95,8 @@ def annotate_morphemes(word, prefixes=prefixes, suffixes=suffixes):
             annotation.append({stack[::-1]: 'root'})
         elif annotation and list(annotation[-1].values())[0] in ('ending', 'suffix', 'interfix', 'root'):
             annotation.append({stack[::-1]: 'root'})
+        elif not annotation:
+            annotation.append({stack[::-1]: 'root'})
         else:
             annotation.append({stack[::-1]: 'unknown'})
     return [list(x.items())[0] for x in annotation[::-1]]