String length check is not made for "About" block

[XFFA.IR Bot]

Under template: member_about:
HTML:

            <xf:if is="$user.Profile.about">
                <div class="block-row block-row--separated">
                    {{ bb_code($user.Profile.about, 'user:about', $user) }}
                </div>
            </xf:if>

if someone were to use 0 then the field would not be shown.