Always return a valid array when retrieving all boolean dates

Author: sebastiaanluca

CHANGELOG.md

@@ -9,6 +9,7 @@ Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) princip
 ### Fixed
 
 - Removed `$booleanDates` trait variable to resolve conflict with the model it's used in
+- Always return a valid array when retrieving all boolean dates
 
 ##  0.2.1 (2018-07-26)
 

src/BooleanDates.php

@@ -66,7 +66,7 @@ public function setAttribute($key, $value)
      */
     public function getBooleanDates() : array
     {
-        return $this->booleanDates;
+        return $this->booleanDates ?? [];
     }
 
     /**