[gnome-music] Add missing logger imports

[Marinus Schraal <mschraal src gnome org>]

commit 5da871882c75d2b883f1c70a052bb6c95162d91b
Author: Jordan Petridis <jordanpetridis protonmail com>
Date:   Mon Aug 21 10:27:09 2017 +0300

    Add missing logger imports
    
    Resolved logger.warn() calls to unitialized logger objects.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=786541

 gnomemusic/views/artistsview.py |    3 +++
 gnomemusic/views/songsview.py   |    3 +++
 2 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/gnomemusic/views/artistsview.py b/gnomemusic/views/artistsview.py
index 1e930b8..a9781a2 100644
--- a/gnomemusic/views/artistsview.py
+++ b/gnomemusic/views/artistsview.py
@@ -22,6 +22,7 @@
 # code, but you are not obligated to do so.  If you do not wish to do so,
 # delete this exception statement from your version.
 
+import logging
 from gettext import gettext as _
 from gi.repository import Gd, GLib, Gtk, Pango
 
@@ -31,6 +32,8 @@ from gnomemusic.views.baseview import BaseView
 from gnomemusic.widgets.artistalbumswidget import ArtistAlbumsWidget
 import gnomemusic.utils as utils
 
+logger = logging.getLogger(__name__)
+
 
 class ArtistsView(BaseView):
     """Main view of all available artists
diff --git a/gnomemusic/views/songsview.py b/gnomemusic/views/songsview.py
index 6e87081..c1b8c3c 100644
--- a/gnomemusic/views/songsview.py
+++ b/gnomemusic/views/songsview.py
@@ -22,6 +22,7 @@
 # code, but you are not obligated to do so.  If you do not wish to do so,
 # delete this exception statement from your version.
 
+import logging
 from gettext import gettext as _
 from gi.repository import Gd, GLib, Gtk, Pango
 
@@ -31,6 +32,8 @@ from gnomemusic.player import DiscoveryStatus
 from gnomemusic.views.baseview import BaseView
 import gnomemusic.utils as utils
 
+logger = logging.getLogger(__name__)
+
 
 class SongsView(BaseView):
     """Main view of all songs sorted artistwise