fix: Don't do album image cover lookup when clearing queue.

Fixes #201.

README.rst

@@ -145,6 +145,8 @@ v2.3.0 (UNRELEASED)
   a small divider rendered above it. (Fixes: `#196 <https://github.com/pimusicbox/mopidy-musicbox-webclient/issues/196>`_).
 - Replaced JavaScript confirmation prompt on 'Streams' pane with jQuery equivalent.
   (Fixes: `#191 <https://github.com/pimusicbox/mopidy-musicbox-webclient/issues/191>`_).
+- Clearing the queue should no longer trigger an album cover image lookup.
+  (Fixes: `#201 <https://github.com/pimusicbox/mopidy-musicbox-webclient/issues/201>`_).
 
 v2.2.0 (2016-03-01)
 -------------------

mopidy_musicbox_webclient/static/js/gui.js

@@ -15,7 +15,7 @@ function resetSong () {
     data.track.name = ''
     data.track.artists = ''
     data.track.length = 0
-    data.track.uri = ' '
+    data.track.uri = ''
     setSongInfo(data)
 }