treat "" 'new' strings as non-existing

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2608 a1c6a512-1295-4272-9138-f99709370657

tools/genlang

@@ -71,7 +71,7 @@ while(<LANG>) {
         if($var eq "new") {
             # the last one for a single phrase
 
-            if(!$value) {
+            if(!$value || ($value eq \"\") ) {
                 # if not set, get the english version
                 $value = $set{'eng'};
             }