Update app.py

app.py

@@ -44,8 +44,11 @@ def summarize_text(text):
                                  do_sample=False,
                                  early_stopping=True)
     summary = tokenizer.decode(summary_ids[0], skip_special_tokens=True)
+     ```python
     if '.' in summary:
-        summary = summary[:summary.rindex('.')+1]
+        index = summary.rindex('.')
+        if index != -1:
+           summary = summary[:index+1]
 
     return summary