Fix lua telnet vlm_message_to_string

In the current lua vlm implementation, messages can have value xor
children but not both. But the "show media" command gives media a
value : ( %d broadcast - %d vod ) and children (if any). (cf
src/input/vlmshell.c:1502)
Signed-off-by: Rémi Duraffort <ivoire@videolan.org>
(cherry picked from commit 1b67e3a69eb1fa93947d0b8f44fdd64e7899ff5f)
Signed-off-by: Rémi Duraffort <ivoire@videolan.org>

modules/misc/lua/libs/vlm.c

@@ -100,7 +100,7 @@ static void push_message( lua_State *L, vlm_message_t *message )
         }
         lua_setfield( L, -2, "children" );
     }
-    else
+    if ( message->psz_value )
     {
         lua_pushstring( L, message->psz_value );
         lua_setfield( L, -2, "value" );

share/lua/intf/telnet.lua

@@ -78,15 +78,13 @@ function vlm_message_to_string(client,message,prefix)
     local prefix = prefix or ""
     if message.value then
         client:append(prefix .. message.name .. " : " .. message.value)
-        return
     else
         client:append(prefix .. message.name)
-        if message.children then
-            for i,c in ipairs(message.children) do
-                vlm_message_to_string(client,c,prefix.."    ")
-            end
+    end
+    if message.children then
+        for i,c in ipairs(message.children) do
+            vlm_message_to_string(client,c,prefix.."    ")
         end
-        return
     end
 end