Resolve #3503311 "Type error array keys argument "

Closes #3503311

modules/graphql_compose_views/src/Plugin/views/display/GraphQL.php

@@ -415,7 +415,7 @@ class GraphQL extends DisplayPluginBase {
         '#caption' => $this->t('GraphQL query %query', [
           '%query' => $this->getGraphQlQueryName(),
         ]),
-        '#header' => array_keys(reset($rows)),
+        '#header' => array_keys($rows ? reset($rows) : []),
         '#rows' => $rows,
       ];
     }