StringListConfigControl finish -> deal with empty ppsz_list_text, same like in...

StringListConfigControl finish -> deal with empty ppsz_list_text, same like in wx widgets, use instead the short text

modules/gui/qt4/components/preferences_widgets.cpp

@@ -462,7 +462,8 @@ void StringListConfigControl::finish(module_config_t *p_module_config, bool byca
 
     for( int i_index = 0; i_index < p_module_config->i_list; i_index++ )
     {
-        combo->addItem( qfu(p_module_config->ppsz_list_text ?
+        combo->addItem( qfu((p_module_config->ppsz_list_text &&
+                            p_module_config->ppsz_list_text[i_index])?
                             p_module_config->ppsz_list_text[i_index] :
                             p_module_config->ppsz_list[i_index] ),
                         QVariant( p_module_config->ppsz_list[i_index] ) );