Convert menu item to seperator only when string is NULL.

diff --git a/controls/menu.c b/controls/menu.c
index 0b89690..35479eb 100644
--- a/controls/menu.c
+++ b/controls/menu.c
@@ -1855,7 +1855,7 @@
 
     if (IS_STRING_ITEM(flags))
     {
-        if (!str || !*str)
+        if (!str)
         {
             flags |= MF_SEPARATOR;
             item->text = NULL;