Merge branch 'layouteditor_issue' into 'master'

#1783::Layout Editor: Default Value is cleared If fieldProperty is enabled/disabled (using a switch UI)

See merge request vtiger/vtigercrm!904

modules/Settings/LayoutEditor/actions/Field.php

@@ -97,12 +97,13 @@ class Settings_LayoutEditor_Field_Action extends Settings_Vtiger_Index_Action {
             $fieldInstance->set('masseditable', $massEditable);
         }
 
-        $defaultValue = $fieldInstance->get('defaultvalue');
-        if (!empty($request->get('fieldDefaultValue'))) {
+	$defaultValue = $fieldInstance->get('defaultvalue');
+        if(!is_null($request->get('fieldDefaultValue', null))) {
             $defaultValue = decode_html($request->get('fieldDefaultValue'));
             $fieldInstance->set('defaultvalue', $defaultValue);
         }
-        $response = new Vtiger_Response();
+	$response = new Vtiger_Response();
+        
         try{
             $fieldInstance->save();
 			$fieldInstance = Settings_LayoutEditor_Field_Model::getInstance($fieldId);