[gnome-music/wip/smcv/issue410] scrobbler: Don't crash if gnome-online-accounts is unavailable

[Marinus Schraal <mschraal src gnome org>]

commit 6f6d7481c7e537b93c08af60b5cc20c5ed10d838
Author: Simon McVittie <smcv debian org>
Date:   Sun Aug 30 15:17:33 2020 +0100

    scrobbler: Don't crash if gnome-online-accounts is unavailable
    
    goa_client_get_manager() can return NULL (in Python,
    GoaClient.get_manager() can return None) if the gnome-online-accounts
    D-Bus service is not available.
    
    Resolves: gnome-music#410
    Bug-Debian: https://bugs.debian.org/969271
    Signed-off-by: Simon McVittie <smcv debian org>

 gnomemusic/scrobbler.py | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/gnomemusic/scrobbler.py b/gnomemusic/scrobbler.py
index 04888594..d133f2fa 100644
--- a/gnomemusic/scrobbler.py
+++ b/gnomemusic/scrobbler.py
@@ -76,6 +76,11 @@ class GoaLastFM(GObject.GObject):
             return
 
         manager = self._client.get_manager()
+
+        if manager is None:
+            self._log.info("GNOME Online Accounts is unavailable")
+            return
+
         try:
             manager.call_is_supported_provider(
                 "lastfm", None, self._lastfm_is_supported_cb)