Merge pull request #37 from Skullbock/main

Fix issue with navigation icons

Author: markvaneijk

src/Resources/EventResource.php

@@ -60,7 +60,7 @@ public static function getPluralModelLabel(): string
         return __('Events');
     }
 
-    public static function getNavigationIcon(): string
+    public static function getNavigationIcon(): ?string
     {
         return 'heroicon-o-calendar';
     }

src/Resources/MailResource.php

@@ -60,7 +60,7 @@ public static function getLabel(): ?string
         return __('Email');
     }
 
-    public static function getNavigationIcon(): string
+    public static function getNavigationIcon(): ?string
     {
         return 'heroicon-o-envelope';
     }

src/Resources/SuppressionResource.php

@@ -59,7 +59,7 @@ public static function getPluralModelLabel(): string
         return __('Suppressions');
     }
 
-    public static function getNavigationIcon(): string
+    public static function getNavigationIcon(): ?string
     {
         return 'heroicon-o-no-symbol';
     }