Does not allow another album art to be set after setting image source to an explicit file URI

[Jim Hodapp]

Trying to add complete cover/album art support for the Ubuntu Touch by allowing the album art to be set with a thumbnailer URI, e.g. "image://thumbnail/<URI>". This works fine. However, when I change the QML surrounding setting the source image for albumArtImage in MediaPlayerMenu.qml to handle the case where the thumbnailer could not find album art for a given track that it would then detect this error and set file:///usr/lib/arm-linux-gnueabihf/unity-scopes/mediascanner-music/album_missing.svg as the fallback image. Once I set this image, it seems that no other album artwork takes effect even though media-hub is passing a valid image URI to indicator-sound. The code that I'm trying to add that demonstrates this situation is (sits in the albumArtImage definition):

onStatusChanged: {
  if (albumArtImage.status === Image.Error) {
    console.debug("Hit an error while loading image, using fallback image")
    albumArtImage.source = "file:///usr/lib/arm-linux-gnueabihf/unity-scopes/mediascanner-music/album_missing.svg";
  }
}