Fix for non-hum reporting devices

git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@401 2b470e98-0d58-463d-a4d8-8e2adae1ed80

FHEM/14_CUL_WS.pm

@@ -220,7 +220,7 @@ CUL_WS_Parse($$)
   my $name = $hash->{NAME};
   Log GetLogLevel($name,4), "CUL_WS $devtype $name: $val";
 
-  if($hum < 0) {
+  if(defined($hum) &&  $hum < 0) {
     Log 1, "BOGUS: $name reading: $val, skipping it";
     return $name;
   }