Show a default cover art when `coverArt` not present in views

setup.py

@@ -47,6 +47,7 @@ setup(
         'sublime': [
             'ui/app_styles.css',
             'ui/images/play-queue-play.png',
+            'ui/images/default-album-art.png',
             'ui/mpris_specs/org.mpris.MediaPlayer2.xml',
             'ui/mpris_specs/org.mpris.MediaPlayer2.Player.xml',
             'ui/mpris_specs/org.mpris.MediaPlayer2.Playlists.xml',

sublime/cache_manager.py

@@ -876,6 +876,11 @@ class CacheManager(metaclass=Singleton):
             force: bool = False,
             allow_download: bool = True,
         ) -> 'CacheManager.Result[Optional[str]]':
+            if id is None:
+                art_path = 'ui/images/default-album-art.png'
+                return CacheManager.Result.from_data(str(
+                    Path(__file__).joinpath(art_path)
+                ))
             return self.return_cached_or_download(
                 f'cover_art/{id}_{size}',
                 lambda: self.server.get_cover_art(id, str(size)),

sublime/ui/images/default-album-art.svg

+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   fill="#000000"
+   viewBox="0 0 24 24"
+   width="384px"
+   height="384px"
+   version="1.1"
+   id="svg6"
+   sodipodi:docname="icons8-music.svg"
+   inkscape:version="0.92.4 5da689c313, 2019-01-14">
+  <metadata
+     id="metadata12">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs10" />
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1366"
+     inkscape:window-height="729"
+     id="namedview8"
+     showgrid="false"
+     inkscape:zoom="0.61458333"
+     inkscape:cx="192"
+     inkscape:cy="192"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg6">
+    <sodipodi:guide
+       position="0,0"
+       orientation="0,384"
+       id="guide14"
+       inkscape:locked="false" />
+    <sodipodi:guide
+       position="24,0"
+       orientation="-384,0"
+       id="guide16"
+       inkscape:locked="false" />
+    <sodipodi:guide
+       position="24,24"
+       orientation="0,-384"
+       id="guide18"
+       inkscape:locked="false" />
+    <sodipodi:guide
+       position="0,24"
+       orientation="384,0"
+       id="guide20"
+       inkscape:locked="false" />
+  </sodipodi:namedview>
+  <rect
+     id="rect22"
+     width="24"
+     height="24"
+     x="0"
+     y="0"
+     style="stroke-width:0.0625;fill:#e6e6e6" />
+  <g
+     id="g26"
+     style="stroke:#b3b3b3">
+    <path
+       id="path2"
+       d="M9 15A3 3 0 1 0 9 21A3 3 0 1 0 9 15Z"
+       stroke-width="2"
+       stroke-miterlimit="10"
+       stroke="#000000"
+       fill="none"
+       style="stroke:#b3b3b3" />
+    <path
+       id="path4"
+       d="M12 18L12 4 18 4 18 8 13 8"
+       stroke-width="2"
+       stroke-miterlimit="10"
+       stroke="#000000"
+       fill="none"
+       style="stroke:#b3b3b3" />
+  </g>
+</svg>