Description:
When starting blueman-applet I get this error messages and no status icon (running Mate DE).
It also seems like there is no python 3 package for AppIndicator only python 2?

blueman-applet version 2.1.1 starting
Stale PID, overwriting
blueman-applet 12.51.28 ERROR PluginManager:90 load_plugin: Unable to load plugin module AppIndicator
Traceback (most recent call last):
File "/usr/lib/python3.7/site-packages/blueman/plugins/applet/AppIndicator.py", line 7, in <module>
require_version('AppIndicator3', '0.1')
File "/usr/lib/python3.7/site-packages/gi/__init__.py", line 129, in require_version
raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace AppIndicator3 not available

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/lib/python3.7/site-packages/blueman/main/PluginManager.py", line 88, in load_plugin
importlib.import_module(self.module_path.__name__ + ".%s" % plugin)
File "/usr/lib/python3.7/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/usr/lib/python3.7/site-packages/blueman/plugins/applet/AppIndicator.py", line 9, in <module>
raise ImportError("AppIndicator3 not found")
ImportError: AppIndicator3 not found
blueman-applet 12.51.28 WARNING PluginManager:147 __load_plugin: Not loading PPPSupport because its conflict has higher priority
blueman-applet 12.51.28 WARNING PluginManager:147 __load_plugin: Not loading DhcpClient because its conflict has higher priority
blueman-applet 12.51.28 WARNING DiscvManager:109 update_menuitems: warning: Adapter is None
blueman-tray version 2.1.1 starting
Stale PID, overwriting



Additional info:
* package version(s): 2.1.1-1
* config and/or log files etc.
* link to upstream bug report, if any

Steps to reproduce:
Install blueman package, enable and start bluetooth.service, start blueman-applet from terminal.