gengrid: fix crash issue.

Sometimes the focused_item can be null.

@fix

legacy/elementary/src/lib/elm_gengrid.c

@@ -3387,6 +3387,7 @@ _key_action_select(Evas_Object *obj, const char *params)
 {
    ELM_GENGRID_DATA_GET(obj, sd);
    Elm_Object_Item *eo_it = elm_object_focused_item_get(obj);
+   if (!eo_it) return EINA_TRUE;
    ELM_GENGRID_ITEM_DATA_GET(eo_it, it);
 
    if (sd->multi &&