Further micro-optimisation in TreeEditorQuerySet.
Further micro-optimisation in TreeEditorQuerySet.

This probably has no noticeable effect but still, avoid work when it's obvious there is nothing to do.
matthiask/django-content-editor,matthiask/feincms2-content,pjdelport/feincms,feincms/feincms,hgrimelid/feincms,hgrimelid/feincms,michaelkuty/feincms,michaelkuty/feincms,nickburlett/feincms,nickburlett/feincms,matthiask/django-content-editor,mjl/feincms,matthiask/feincms2-content,matthiask/feincms2-content,matthiask/django-content-editor,pjdelport/feincms,michaelkuty/feincms,feincms/feincms,feincms/feincms,joshuajonah/feincms,nickburlett/feincms,joshuajonah/feincms,pjdelport/feincms,joshuajonah/feincms,mjl/feincms,michaelkuty/feincms,nickburlett/feincms,joshuajonah/feincms,hgrimelid/feincms,mjl/feincms,matthiask/django-content-editor