Update difflib

Author: donBarbos

Lib/difflib.py

@@ -1053,8 +1053,7 @@ def IS_LINE_JUNK(line, pat=None):
     """
 
     if pat is None:
-        stripped = line.strip()
-        return stripped == '' or stripped == '#'
+        return line.strip() in ('', '#')
     return pat(line) is not None
 
 def IS_CHARACTER_JUNK(ch, ws=" \t"):