Feature: [admin][ActivityReason] improve administration for activity reason

* list alphabetically;
* show "active" in index

src/Bundle/ChillActivityBundle/Entity/ActivityReason.php

@@ -63,10 +63,8 @@ class ActivityReason
 
     /**
      * Get category.
-     *
-     * @return ActivityReasonCategory
      */
-    public function getCategory()
+    public function getCategory(): ?ActivityReasonCategory
     {
         return $this->category;
     }
@@ -107,6 +105,11 @@ class ActivityReason
         return $this->name;
     }
 
+    public function isActiveAndParentActive(): bool
+    {
+        return $this->active && null !== $this->getCategory() && $this->getCategory()->getActive();
+    }
+
     /**
      * Set active.
      *