message: Fix ProfileSettings when avatarUrl is null
diff: @@ -202,7 +202,7 @@ export default class ProfileSettings extends React.Component<{}, IState> {
  </p>
  </div>
  <AvatarSetting
  - avatarUrl={this.state.avatarUrl.toString()}
  + avatarUrl={this.state.avatarUrl?.toString()}
  avatarName={this.state.displayName || this.state.userId}
  avatarAltText={_t("Profile picture")}
  uploadAvatar={this.uploadAvatar}
  