Add messages to LiveTvConflict exception

MediaBrowser.Controller/LiveTv/LiveTvConflictException.cs

@@ -9,10 +9,6 @@ namespace MediaBrowser.Controller.LiveTv
     /// </summary>
     public class LiveTvConflictException : Exception
     {
-        public LiveTvConflictException()
-        {
-        }
-
         public LiveTvConflictException(string message)
             : base(message)
         {

src/Jellyfin.LiveTv/TunerHosts/BaseTunerHost.cs

@@ -219,7 +219,7 @@ namespace Jellyfin.LiveTv.TunerHosts
                 }
             }
 
-            throw new LiveTvConflictException();
+            throw new LiveTvConflictException("Unable to find host to play channel");
         }
 
         protected virtual bool IsValidChannelId(string channelId)

src/Jellyfin.LiveTv/TunerHosts/HdHomerun/HdHomerunManager.cs

@@ -145,7 +145,7 @@ namespace Jellyfin.LiveTv.TunerHosts.HdHomerun
             }
 
             _activeTuner = -1;
-            throw new LiveTvConflictException();
+            throw new LiveTvConflictException("No tuners available");
         }
 
         public async Task ChangeChannel(IHdHomerunChannelCommands commands, CancellationToken cancellationToken)