Merge pull request #2649 from sergevanginderachter/bin-ansible

make bin/ansible error output consistent for shell module as for the command module when no arguments are given

bin/ansible

@@ -93,8 +93,9 @@ class Cli(object):
                 print '    %s' % host
             sys.exit(0)
 
-        if options.module_name == 'command' and not options.module_args:
+        if ((options.module_name == 'command' or options.module_name == 'shell')
-            print >>sys.stderr, "No argument passed to command module"
+                and not options.module_args):
+            print >>sys.stderr, "No argument passed to %s module" % options.module_name
             sys.exit(1)
 
         sshpass = None