Test runner: fix empty patches; better error message for missing test files; correct .gitignore ent…

tools/testrunner/network/endpoint.py

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 90 matching lines @@
     suite = suites_dict[t.suite]
     t.suite = suite
     suite.tests.append(t)
 
   suites = [ s for s in suites if len(s.tests) > 0 ]
   for s in suites:
     s.DownloadData()
 
   progress_indicator = EndpointProgress(sock, server, ctx)
   runner = execution.Runner(suites, progress_indicator, ctx)
-  runner.Run(server.jobs)
+  try:
+    runner.Run(server.jobs)
+  except IOError, e:
+    if e.errno == 2:
+      message = ("File not found: %s, maybe you forgot to 'git add' it?" %
+                 e.filename)
+    else:
+      message = "%s" % e
+    compression.Send([-1, message], sock)
   progress_indicator.HasRun(None)  # Sentinel to signal the end.
   progress_indicator.sender_lock.acquire()  # Released when sending is done.
   progress_indicator.sender_lock.release()