sys.exit(1) if globbing matches no files/directories

After more testing, I realized that I did not take into account the possibility that the wildcard pattern would not match anything. In that case, the following 'if not arguments' clause would run wmllint on the entire current directory - which could very well be something that you do not want!

data/tools/wmllint

@@ -2427,7 +2427,11 @@ if __name__ == '__main__':
                 for arg in arguments:
                     for wild in glob(arg):
                         newargs.append(wild)
-                arguments = newargs
+                if newargs:
+                    arguments = newargs
+                else:
+                    sys.stderr.write('wmllint: wildcard did not match any files or directories (%s)\n'%arguments)
+                    sys.exit(1)
 
         if not arguments:
             arguments = ["."]