pak_util: delete redundant error message code

This deletes a redundant block of code which manually checks arguments
(this is already done by the argparse module). This resolves a bug,
since this code references an undefined `actions` variable.

Bug: 960598
Test: tools/grit/pak_util.py # useful help output
Test: tools/grit/pak_util.py not-a-command # useful help output
Test: tools/grit/pak_util.py repack # useful help output
Change-Id: Idda7d8c16878c2cc99a1407eaeeb7c7d56f8d8d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1600605
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657583}

tools/grit/pak_util.py

@@ -137,13 +137,6 @@ def main():
       help='The resource list path to write (default stdout)')
   sub_parser.set_defaults(func=_ListMain)
 
-  if len(sys.argv) == 1:
-    parser.print_help()
-    sys.exit(1)
-  elif len(sys.argv) == 2 and sys.argv[1] in actions:
-    parser.parse_args(sys.argv[1:] + ['-h'])
-    sys.exit(1)
-
   args = parser.parse_args()
   args.func(args)