Fix/1116 fix action nullable fields (#1117)

* Temp ActionField attack type missing

* Move missing attack type to getModel

* Damage/Healing fields nullable fix

* Fix TargetField null value

* Other fixes

* Fix Action type to be not nullable

module/data/action/baseAction.mjs

@@ -32,7 +32,8 @@ export default class DHBaseAction extends ActionMixin(foundry.abstract.DataModel
             actionType: new fields.StringField({
                 choices: CONFIG.DH.ITEM.actionTypes,
                 initial: 'action',
-                nullable: true
+                nullable: false,
+                required: true
             })
         };