Merge pull request #5848 from sgmoore/IndexError

Fix ArgumentOutOfRangeException scanning AudioBooks

(cherry picked from commit 665220c4fb903792fd8aea81db1c3e5d85a9b036)
Signed-off-by: Joshua M. Boniface <joshua@boniface.me>

Emby.Server.Implementations/Library/Resolvers/Audio/AudioResolver.cs

@@ -201,6 +201,11 @@ namespace Emby.Server.Implementations.Library.Resolvers.Audio
                     continue;
                 }
 
+                if (resolvedItem.Files.Count == 0)
+                {
+                    continue;
+                }
+
                 var firstMedia = resolvedItem.Files[0];
 
                 var libraryItem = new T