Catch error when credentials are empty.

Author: MariusKnirk

src/OhDear.php

@@ -158,7 +158,7 @@ public function getCpNavItem(): ?array
 
     private function registerWidgets(): void
     {
-        if (! $this->settings->hasApiCredentials()) {
+        if (! $this->getSettings()->hasApiCredentials()) {
             return;
         }
 

src/models/Settings.php

@@ -55,15 +55,15 @@ public function behaviors(): array
      */
     public function hasApiCredentials(): bool
     {
-        return ! empty($this->apiToken) && ! empty($this->selectedSiteId);
+        return ! empty($this->apiToken) && ! empty($this->selectedSiteId) && ! empty($this->getApiToken()) && ! empty($this->getSelectedSiteId());
     }
 
-    public function getApiToken(): string
+    public function getApiToken(): ?string
     {
         return App::parseEnv($this->apiToken);
     }
 
-    public function getSelectedSiteId(): string
+    public function getSelectedSiteId(): ?string
     {
         return App::parseEnv($this->selectedSiteId);
     }

src/services/OhDearService.php

@@ -49,6 +49,10 @@ class OhDearService extends Component
     public function __construct($config = [])
     {
         parent::__construct($config);
+        
+        if (! OhDear::$plugin->getSettings()->hasApiCredentials()) {
+            throw new Exception('Oh Dear credentials are not set. Please check your settings.');
+        }
 
         $this->monitorId = intval(OhDear::$plugin->getSettings()->getSelectedSiteId());
         $this->apiToken = OhDear::$plugin->getSettings()->getApiToken();