Remove unused theme that was causing a fault in p3k.

Lib/idlelib/PyShell.py

@@ -299,7 +299,6 @@ class ModifiedColorDelegator(ColorDelegator):
             "stdout": idleConf.GetHighlight(theme, "stdout"),
             "stderr": idleConf.GetHighlight(theme, "stderr"),
             "console": idleConf.GetHighlight(theme, "console"),
-            None: idleConf.GetHighlight(theme, "normal"),
         })
 
 class ModifiedUndoDelegator(UndoDelegator):