Plugin System: Plugin config enabled even if there is none
Versions
OS: Linux
GTK Version: 3.24.22
PyGObject Version: 3.36.1
GLib Version : 2.64.4
python-nbxmpp Version: 1.0.2
Gajim Version: 1.2.2
Traceback
Traceback (most recent call last): File "/app/lib/python3.7/site-packages/gajim/plugins/gui.py", line 232, in _on_configure_plugin plugin.config_dialog(self)TypeError: 'NoneType' object is not callable
Steps to reproduce the problem
Using the flatpak appindicator plugin
When enabling the plugin the settings button is clickable
Clicking the button yields a crash report (the button does not open anything here, therefore the manual report)
