contrib/patchbomb: Fix buglet with empty cc list.

contrib/patchbomb: Fix buglet with empty cc list.

--- a/contrib/patchbomb	Sun Aug 21 23:03:14 2005 -0800
+++ b/contrib/patchbomb	Sun Aug 21 23:33:02 2005 -0800
@@ -172,7 +172,7 @@
     to = [t.strip() for t in to.split(',')]
     cc = (opts['cc'] or ui.config('patchbomb', 'cc') or
           prompt('Cc', default = ''))
-    cc = [c.strip() for c in cc.split(',')]
+    cc = (cc and [c.strip() for c in cc.split(',')]) or []
 
     ui.write('Finish with ^D or a dot on a line by itself.\n\n')