Throw an InvalidArgumentException when missing the array key

Enforces the new state. Consider adding a BadConfigurationException?

Author: emmadesilva

packages/framework/src/Foundation/Concerns/HasKernelData.php

@@ -5,6 +5,7 @@
 namespace Hyde\Foundation\Concerns;
 
 use Hyde\Facades\Config;
+use InvalidArgumentException;
 use Illuminate\Support\Collection;
 use Hyde\Framework\Features\Blogging\Models\PostAuthor;
 
@@ -50,6 +51,10 @@ public function authors(): Collection
     protected function parseConfigurationAuthors(Collection $authors): Collection
     {
         return $authors->mapWithKeys(function (PostAuthor $author, string $username): array {
+            if (! $username) {
+                throw new InvalidArgumentException('Author username cannot be empty. Did you forget to set the author\'s array key?');
+            }
+
             return [$username => tap($author, fn (PostAuthor $author) => $author->username = $username)];
         });
     }

packages/framework/tests/Feature/HydeKernelTest.php

@@ -6,6 +6,7 @@
 
 use Hyde\Facades\Author;
 use Hyde\Facades\Features;
+use InvalidArgumentException;
 use Hyde\Foundation\Facades\Pages;
 use Illuminate\Support\Collection;
 use Hyde\Foundation\Facades\Routes;
@@ -591,6 +592,16 @@ public function testAuthorsUseTheConfigArrayKeyAsTheUsername()
             ],
         ], Hyde::authors()->toArray());
     }
+
+    public function testAuthorsThrowsExceptionWhenUsernameIsNotSet()
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('Author username cannot be empty. Did you forget to set the author\'s array key?');
+
+        Config::set('hyde.authors', ['' => Author::create('foo')]);
+
+        Hyde::authors();
+    }
 }
 
 class CallableClass