Fix daemon key provider service

Handles missing keys if user is an admin or the server owner. Step in the right direction for #733 where all users have their own keys now. Still need to address admin status revocation in order to fully address that issue.

app/Repositories/Eloquent/DaemonKeyRepository.php

@@ -39,6 +39,26 @@ class DaemonKeyRepository extends EloquentRepository implements DaemonKeyReposit
         return DaemonKey::class;
     }
 
+    /**
+     * Load the server and user relations onto a key model.
+     *
+     * @param \Pterodactyl\Models\DaemonKey $key
+     * @param bool                          $refresh
+     * @return \Pterodactyl\Models\DaemonKey
+     */
+    public function loadServerAndUserRelations(DaemonKey $key, bool $refresh = false): DaemonKey
+    {
+        if (! $key->relationLoaded('server') || $refresh) {
+            $key->load('server');
+        }
+
+        if (! $key->relationLoaded('user') || $refresh) {
+            $key->load('user');
+        }
+
+        return $key;
+    }
+
     /**
      * {@inheritdoc}
      */

app/Repositories/Eloquent/SubuserRepository.php

@@ -65,13 +65,16 @@ class SubuserRepository extends EloquentRepository implements SubuserRepositoryI
     }
 
     /**
-     * {@inheritdoc}
+     * Return a subuser and associated permissions given a user_id and server_id.
+     *
+     * @param int $user
+     * @param int $server
+     * @return \Pterodactyl\Models\Subuser
+     *
+     * @throws \Pterodactyl\Exceptions\Repository\RecordNotFoundException
      */
-    public function getWithPermissionsUsingUserAndServer($user, $server)
+    public function getWithPermissionsUsingUserAndServer(int $user, int $server): Subuser
     {
-        Assert::integerish($user, 'First argument passed to getWithPermissionsUsingUserAndServer must be integer, received %s.');
-        Assert::integerish($server, 'Second argument passed to getWithPermissionsUsingUserAndServer must be integer, received %s.');
-
         $instance = $this->getBuilder()->with('permissions')->where([
             ['user_id', '=', $user],
             ['server_id', '=', $server],