Minor lifecycle fix in WBJsonViewer.

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

@@ -5,6 +5,12 @@ import makeArvadosRequest from 'make-arvados-request';
 import arvadosObjectName from 'arvados-object-name';
 
 class WBLazyInlineName extends Component {
+  componentWillReceiveProps(nextProps) {
+    if (nextProps.identifier === this.props.identifier)
+      return;
+    this.setState({ item: null });
+  }
+
   fetchData() {
     const { app, identifier } = this.props;
     const { arvHost, arvToken } = app.state;