Fix proxmox with offline node (#730)

* Exclude .idea from beeing tracked in repository
* Ensure encoded body is of type stdClass before accessing it. This will prevent throwing an exception if one node is offline.
* Use correct ident config for phpfiles. Fix phpcs errors.

.editorconfig

@@ -21,3 +21,7 @@ indent_style = space
 [*.{json,json5,webmanifest}]
 indent_size = 2
 indent_style = space
+
+[*.php]
+indent_size = 4
+indent_style = space

.gitignore

@@ -4,3 +4,4 @@ dist
 Vaultwarden/Thumbs.db
 BrotherPrinter/Thumbs.db
 Rustdesk/Thumbs.db
+.idea

Proxmox/Proxmox.php

@@ -92,22 +92,27 @@ public function livestats()
         ];
         return parent::getLiveStats($status, $data);
     }
+
     public function url($endpoint)
     {
         $api_stub = "api2/json/";
-        $api_url =
-            parent::normaliseurl(
-                $this->getConfigValue("override_url", $this->config->url)
-            ) .
-            $api_stub .
-            $endpoint;
+        $api_url = parent::normaliseurl(
+            $this->getConfigValue("override_url", $this->config->url)
+        ) .
+        $api_stub .
+        $endpoint;
         return $api_url;
     }
 
     public function apiCall($endpoint)
     {
         $res = parent::execute($this->url($endpoint), $this->getRequestAttrs());
-        return json_decode($res->getBody())->data;
+        $object = json_decode($res->getBody());
+
+        if (!$object instanceof \stdClass) {
+            return null;
+        }
+        return $object->data;
     }
 
     public function getConfigValue($key, $default = null)