Only add internal files if the internal metadata path exists

Signed-off-by: Cody Robibero <cody@robibe.ro>

MediaBrowser.Controller/Providers/DirectoryService.cs

@@ -3,6 +3,7 @@
 using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using MediaBrowser.Model.IO;
 
@@ -78,5 +79,9 @@ namespace MediaBrowser.Controller.Providers
 
             return filePaths;
         }
+
+        /// <inheritdoc />
+        public bool PathExists(string path)
+            => Directory.Exists(path);
     }
 }

MediaBrowser.Controller/Providers/IDirectoryService.cs

@@ -16,5 +16,12 @@ namespace MediaBrowser.Controller.Providers
         IReadOnlyList<string> GetFilePaths(string path);
 
         IReadOnlyList<string> GetFilePaths(string path, bool clearCache, bool sort = false);
+
+        /// <summary>
+        /// Does the path exist.
+        /// </summary>
+        /// <param name="path">The path.</param>
+        /// <returns>Whether the path exists.</returns>
+        bool PathExists(string path);
     }
 }