removed parsley validation on step 3

- fixed placeholder for select2 instances in settings
- fixed issue in sending queue worker when newsletter does not exist

assets/js/src/form/fields/selection.jsx

@@ -120,7 +120,7 @@ function(
         <select
           id={ this.props.field.id || this.props.field.name }
           ref="select"
-          placeholder={ this.props.field.placeholder }
+          data-placeholder={ this.props.field.placeholder }
           multiple={ this.props.field.multiple }
           defaultValue={ default_value }
           {...this.props.field.validation}

assets/js/src/newsletters/send.jsx

@@ -145,14 +145,6 @@ define(
           }.bind(this));
         }
       },
-      componentDidMount: function() {
-        if(this.isMounted()) {
-          jQuery('#mailpoet_newsletter').parsley();
-        }
-      },
-      isValid: function() {
-        return (jQuery('#mailpoet_newsletter').parsley().validate());
-      },
       render: function() {
         return (
           <div>
@@ -166,8 +158,7 @@ define(
               fields={ fields }
               params={ this.props.params }
               messages={ messages }
-              isValid={ this.isValid }>
-
+            >
               <p className="submit">
                 <input
                   className="button button-primary"