Issue #3458095 by yas, zterry95: Fix compatibility with Maclof\Kubernetes\Client

Closes #3458095

modules/cloud_service_providers/k8s/src/Service/K8sClientExtension/K8sClient.php

@@ -26,25 +26,32 @@ class K8sClient extends Client {
     $method,
     $uri,
     $query = [],
-    $body = [],
+    $body = NULL,
     $namespace = TRUE,
     $apiVersion = NULL,
     array $requestOptions = [],
   ) {
+
+    // Normalize $body to either NULL or a non-empty string if appropriate.
+    $body = empty($body) && !is_bool($body) && !is_numeric($body) ? NULL : $body;
+    if (!is_null($body) && !is_string($body)) {
+      throw new \InvalidArgumentException('A variable $body must be a string, array, or NULL');
+    }
+
     try {
-      if ($method === 'PUT' || $method === 'POST') {
-        // If the resource type is role or cluster role, the apiGroups maybe
-        // empty, and it cannot be removed.
-        if (!in_array($uri, ['/roles', '/clusterroles'], TRUE)) {
-          $array = $this->removeEmptyProperties(json_decode($body, TRUE));
-          $body = json_encode($array, JSON_PRETTY_PRINT);
-        }
+      // If the resource type is K8s role or cluster role, the apiGroups maybe
+      // empty, then it cannot be removed.
+      if (!empty($body)
+      && in_array($method, ['PUT', 'POST'])
+      && !in_array($uri, ['/roles', '/clusterroles'], TRUE)) {
+        $array = $this->removeEmptyProperties(json_decode($body, TRUE));
+        $body = json_encode($array, JSON_PRETTY_PRINT);
       }
 
-      if (empty($this->namespace)) {
-        $namespace = FALSE;
-      }
+      // Fallback for namespace availability.
+      $namespace = !empty($this->namespace);
 
+      // Handling different response statuses.
       $response = parent::sendRequest(
         $method,
         $uri,