Fix no identity server in help & about settings (#10563)

Author: t3chguy

src/components/views/settings/tabs/user/HelpUserSettingsTab.tsx

@@ -338,15 +338,16 @@ export default class HelpUserSettingsTab extends React.Component<IProps, IState>
                             )}
                         </div>
                         <div>
-                            {_t(
-                                "Identity server is <code>%(identityServerUrl)s</code>",
-                                {
-                                    identityServerUrl: MatrixClientPeg.get().getIdentityServerUrl(),
-                                },
-                                {
-                                    code: (sub) => <code>{sub}</code>,
-                                },
-                            )}
+                            {MatrixClientPeg.get().getIdentityServerUrl() &&
+                                _t(
+                                    "Identity server is <code>%(identityServerUrl)s</code>",
+                                    {
+                                        identityServerUrl: MatrixClientPeg.get().getIdentityServerUrl(),
+                                    },
+                                    {
+                                        code: (sub) => <code>{sub}</code>,
+                                    },
+                                )}
                         </div>
                         <details>
                             <summary>{_t("Access Token")}</summary>