Description of problem:
I tried to select the Edit Properties item in the mate-menu

Version-Release number of selected component:
mate-menu-19.04.0-5.fc32

Additional info:
reporter:       libreport-2.13.1
cgroup:         0::/user.slice/user-1000.slice/user/dbus\x2d:1.2\x2dorg.mate.panel.applet.MateMenuAppletFactory.slice/dbus-:1.2-org.mate.panel.applet.MateMenuAppletFactory
cmdline:        mate-menu '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' '' ''
crash_function: get_system_item_paths
exception_type: AttributeError
executable:     /usr/lib/mate-menu/mate-menu.py
interpreter:    mate-menu-19.04.0-5.fc32.noarch
kernel:         5.6.15-300.fc32.x86_64
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
applications.py:64:get_system_item_paths:AttributeError: '_Environ' object has no attribute 'has_key'

Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/mate_menu/plugins/applications.py", line 1046, in onPropsApp
    sysPaths = get_system_item_paths()
  File "/usr/lib/python3.8/site-packages/mate_menu/plugins/applications.py", line 64, in get_system_item_paths
    if os.environ.has_key('XDG_DATA_DIRS'):
AttributeError: '_Environ' object has no attribute 'has_key'

Local variables in innermost frame:
item_dirs: []