sib_order must be removed in AL_Node.dump_bulk only if it exists
sib_order must be removed in AL_Node.dump_bulk only if it exists

skirsdeda/django-treebeard,tabo/django-treebeard,tabo/django-treebeard,skirsdeda/django-treebeard,tabo/django-treebeard,django-treebeard/django-treebeard,tabo/django-treebeard,django-treebeard/django-treebeard,django-treebeard/django-treebeard,skirsdeda/django-treebeard,skirsdeda/django-treebeard