Xpra: Ticket #2333: Missing package

There seems to be a regression related to missing package in the latest version of xpra on MacOS. If I install Xpra-x86_64-2.4.3-r21365, it starts fine. However, if I try to install Xpra-x86_64-2.5.2-r22874 it gives the following error:

> xpra
2019-06-15 10:58:26,566 Error: gtkosx_application module is missing - trying to continue anyway
xpra main error:
Traceback (most recent call last):
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/scripts/main.py", line 97, in main
    return run_mode(script_file, err, options, args, mode, defaults)
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/scripts/main.py", line 453, in run_mode
    from xpra.gtk_common.gui import main as gui_main        #@Reimport
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/gtk_common/gui.py", line 15, in <module>
    from xpra.gtk_common.gtk_util import (
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/gtk_common/gtk_util.py", line 22, in <module>
    gtk     = import_gtk()
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/gtk_common/gobject_compat.py", line 131, in import_gtk
    return  _try_import(import_gtk3, import_gtk2)
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/gtk_common/gobject_compat.py", line 71, in _try_import
    imported = trygtk3()
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/gtk_common/gobject_compat.py", line 60, in trygtk3
    return import_method_gtk3()
  File "/Applications/Xpra.app/Contents/Resources/lib/python/xpra/gtk_common/gobject_compat.py", line 127, in import_gtk3
    from gi.repository import Gtk                   #@UnresolvedImport
ImportError: No module named gi.repository