Improve support for custom configuration of ReportContainers

Previously any configuration that was made via makeConfig() before being passed to the ReportContainer would cause it to break. This fixes that issue.

Author: LukeTowers

modules/backend/widgets/ReportContainer.php

@@ -82,7 +82,7 @@ public function __construct($controller, $configuration = null)
             $configuration = 'config_report_container.yaml';
         }
 
-        if (!is_array($configuration)) {
+        if (is_string($configuration)) {
             $path = $controller->getConfigPath($configuration);
             if (File::isFile($path)) {
                 $configuration = $this->makeConfig($path);