allButOneCollection in ArmaTools.py fails with empty list

[computerchemist]

Running Blender 4.3 with latest Armatools- a p3d that loads OK with previous legacy ArmaTools in 3.6 and loads OK in ObjectBuilder, fails when it's trying to access a null list to get first_name set in latest version as it's importing.
This was my workaround hack, not sure what that does elsewhere tho:

def allButOneCollection(context):
colls = context.collection.children_recursive
#DAVE FIX
if not colls:
return
#END DAVE FIX
first_name = colls[0].name`

I haven't submitted it as a merge request because I realize I'm leaving first_name potentially undefined somewhere else. But now it loads OK and saves OK (for me). Not sure whether having no collection is a bug for my p3d, or an edge case.