Do not use lastFM api key and secret to determine if LastFM.Enabled should be set.

server/serve_index.go

@@ -61,7 +61,7 @@ func serveIndex(ds model.DataStore, fs fs.FS, shareInfo *model.Share) http.Handl
 			"enableSharing":             conf.Server.EnableSharing,
 			"defaultDownloadableShare":  conf.Server.DefaultDownloadableShare,
 			"devSidebarPlaylists":       conf.Server.DevSidebarPlaylists,
-			"lastFMEnabled":             conf.Server.LastFM.Enabled && conf.Server.LastFM.ApiKey != "" && conf.Server.LastFM.Secret != "",
+			"lastFMEnabled":             conf.Server.LastFM.Enabled,
 			"devShowArtistPage":         conf.Server.DevShowArtistPage,
 			"listenBrainzEnabled":       conf.Server.ListenBrainz.Enabled,
 			"enableExternalServices":    conf.Server.EnableExternalServices,

server/serve_index_test.go

@@ -283,8 +283,6 @@ var _ = Describe("serveIndex", func() {
 
 	It("sets the lastFMEnabled", func() {
 		conf.Server.LastFM.Enabled = true
-		conf.Server.LastFM.ApiKey = "123"
-		conf.Server.LastFM.Secret = "456"
 
 		r := httptest.NewRequest("GET", "/index.html", nil)
 		w := httptest.NewRecorder()

ui/src/personal/Personal.js

@@ -27,7 +27,9 @@ const Personal = () => {
         <SelectDefaultView />
         {config.enableReplayGain && <ReplayGainToggle />}
         <NotificationsToggle />
-        {config.lastFMEnabled && <LastfmScrobbleToggle />}
+        {config.lastFMEnabled && localStorage.getItem('lastfm-apikey') && (
+          <LastfmScrobbleToggle />
+        )}
         {config.listenBrainzEnabled && <ListenBrainzScrobbleToggle />}
       </SimpleForm>
     </Card>