Fix ESLint (#6335)

(cherry picked from commit c3837c9f7b50534e3eafe1d9fbaf360fee4588b7)

Co-authored-by: Mark McDowall <mark@mcdowall.ca>

frontend/src/System/Tasks/Queued/QueuedTaskRow.js

@@ -198,10 +198,11 @@ class QueuedTaskRow extends Component {
             {commandName}
           </span>
           {
-            clientUserAgent &&
+            clientUserAgent ?
               <span className={styles.userAgent} title={translate('TaskUserAgentTooltip')}>
                 {translate('from')}: {clientUserAgent}
-              </span>
+              </span> :
+              null
           }
         </TableRowCell>