Various minor fixes

app/Model/Base.php

@@ -26,6 +26,7 @@ use PicoDb\Database;
  * @property \Model\SubTask            $subTask
  * @property \Model\Task               $task
  * @property \Model\User               $user
+ * @property \Model\Webhook            $webhook
  */
 abstract class Base
 {

app/Model/Project.php

@@ -431,7 +431,7 @@ class Project extends Base
             unset($category['id']);
             $category['project_id'] = $project_to;
 
-            if (! $categoryModel->create($category)) {
+            if (! $this->category->create($category)) {
                 return false;
             }
         }