FHEMWEB: avoid error-message when webCmd argument is space

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@4874 2b470e98-0d58-463d-a4d8-8e2adae1ed80

fhem/FHEM/01_FHEMWEB.pm

@@ -1220,8 +1220,8 @@ FW_showRoom()
         if(!$FW_ss && $cmdlist) {
           foreach my $cmd (split(":", $cmdlist)) {
             my $htmlTxt;
-            my @c = split(' ', $cmd);
-            if($allSets && $allSets =~ m/$c[0]:([^ ]*)/) {
+            my @c = split(' ', $cmd);   # @c==0 if $cmd==" ";
+            if(int(@c) && $allSets && $allSets =~ m/$c[0]:([^ ]*)/) {
               my $values = $1;
               foreach my $fn (sort keys %{$data{webCmdFn}}) {
                 no strict "refs";