Gtk.TreePath.str() returns None for path with depth 0

Submitted by Jeffery To

This throws a TypeError ("__str__ returned a non-string (type NoneType)"):

p = Gtk.TreePath.new() # creates a TreePath with depth 0
str(p)

I would suggest __str__() return the empty string in this case, but I'm not sure if this should apply to to_string() as well.

I have pygobject 3.22 installed but I believe this applies to git master as well.

Edited Mar 18, 2018 by Christoph Reiter