Qt4: enable all messages only if filter is empty

(cherry picked from commit eadba593)
Signed-off-by: Ilkka Ollakka <ileoo@videolan.org>

modules/gui/qt4/dialogs/messages.cpp

@@ -195,10 +195,9 @@ void MessagesDialog::updateConfig()
     config_PutPsz(p_intf, "verbose-objects", qtu(vbobjectsEdit->text()));
     //vbobjectsEdit->setText("vbEdit changed!");
 
-    char * psz_verbose_objects = strdup(qtu(vbobjectsEdit->text()));
-    msg_EnableObjectPrinting(p_intf, "all");
-    if( psz_verbose_objects )
+    if( !vbobjectsEdit->text().isEmpty() )
     {
+        char * psz_verbose_objects = strdup(qtu(vbobjectsEdit->text()));
         char * psz_object, * iter =  psz_verbose_objects;
         while( (psz_object = strsep( &iter, "," )) )
         {
@@ -211,6 +210,10 @@ void MessagesDialog::updateConfig()
         }
         free( psz_verbose_objects );
     }
+    else
+    {
+        msg_EnableObjectPrinting( p_intf, "all");
+    }
 }
 
 void MessagesDialog::sinkMessage( msg_item_t *item )