Error box spacing in WBJsonEditor.

frontend/src/js/component/wb-json-editor.js

@@ -25,7 +25,7 @@ class WBJsonEditor extends Component {
             <textarea class="form-control wb-json-editor" value={ editValue } rows="10"
               onChange={ e => this.setState({ editValue: e.target.value }) } />
             { parseError ? (
-              <div class="alert alert-danger" role="alert">
+              <div class="alert alert-danger mt-2" role="alert">
                 { parseError }
               </div>
             ) : null }