fix sentence annotation

helpers.py

@@ -6,6 +6,8 @@ colors = {
         'SequenceVariant': '#e2b0ff',  # Pastel purple
         'CellLine': '#ffcc99'  # Pastel peach
     }
+
+def annotate_sentence(sentence, predictions):
     output = []
     i = 0
     for p in predictions:
@@ -17,6 +19,6 @@ colors = {
             else sentence[p['start']:p['end']]
             )
         i = p['end']
-    if sentence[p['end']:]:
+    if sentence[i:] != '':
         output.append(sentence[p['end']:])
     return output