fix mapping screen crash when office/resource is unknown

client/src/scenes/RoomOfficeNameMapping/components/SingleMapping.js

@@ -76,6 +76,7 @@ class SingleMapping extends Component {
     };
 
     render() {
+        try {
             const {singleMapping: {officeSlug, resourceSlug}} = this.props;
             const {officeId, resourceId, officeOptions, allResourceOptions, pendingMappings} = this.props;
             const {showDeletePrompt, newOfficeId, newResourceId} = this.state;
@@ -137,6 +138,9 @@ class SingleMapping extends Component {
                     </Table.Cell>
                 </Table.Row>
             );
+        }catch (e) {
+            return null;
+        }
     }
 }