10_ZWave.pm: Checking the rgb parameter

git-svn-id: https://svn.fhem.de/fhem/trunk@8431 2b470e98-0d58-463d-a4d8-8e2adae1ed80

fhem/FHEM/10_ZWave.pm

@@ -449,7 +449,7 @@ ZWave_Cmd($$@)
   }
 
   if($type eq "set" && $cmd eq "rgb") {
-     if($a[0] =~ m/0-9A-F/i && $a[0] =~ /^(..)(..)(..)$/) {
+     if($a[0] && $a[0] =~ m/^[0-9A-F]+$/i && $a[0] =~ /^(..)(..)(..)$/) {
        @a = (hex($1), hex($2), hex($3));
      } else {
        return "set rgb: a 6-digit hex number is required";