Empty Tray Icon

[MKuranowski]

Checklist:

• [x] I have checked that there are no issues with similar or the same content: seems silimar to #1057, but that issue is with KDE, I'm running GNOME.
• [x] I have checked the FAQ (https://github.com/MarshallOfSound/Google-Play-Music-Desktop-Player-UNOFFICIAL-/wiki/FAQ) and the answer I am looking for is not there
• [x] I have double checked and can reproduce the issue

OS: Ubuntu 18.04.2 LTS, AMD64 (Gnome) GPMDP Version: 4.6.1 Issue Descriptions: The tray icon is invisible/empty (the underlined tray "icon" should show the GPMDP icon)
Steps to Reproduce: Install GPMDP, no steps required

To clarify: the "icon" is there, and I can click it, just there's no actual icon. Disabling Dash to Panel doesn't change anything.

Workoaround described in #3133 and/or reverting the icon tray colors aren't working.

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[Faults]

Hey, I have the same issue with Ubuntu 19.04 Beta.

[MKuranowski]

I found this while messing in syslog:

Apr 20 14:42:19 orion gnome-shell[3244]: [AppIndicatorSupport-DEBUG] Registering StatusNotifierItem :1.351/org/ayatana/NotificationItem/Google_Play_Music_Desktop_Player1
Apr 20 14:42:19 orion gnome-shell[3244]: [AppIndicatorSupport-FATAL] unable to lookup icon for Google Play Music Desktop Player1_1

[MarshallOfSound]

This should be fixed as part of the Electron update rolling through soon