Don't expect `BaseItem` to be a movie/video file.

This fix is mainly so I can mass-add series _and_ movie entries using a
`IMultiItemResolver` without having to resort to complicated logic
using _both_ a `IItemResolver` and a `IMultiItemResolver` by splitting
up what gets added where.

I've also added three new interface methods to the `IDirectoryService`,
one of which is used in the modified
`ResolverHelper.SetInitialItemValues(…)` to get the file system entry
info for the item regardless of which type the file system entry is.

In my local testing so far I haven't found any issues introduced
by this change.

1 files changed, 13 insertions, 1 deletions

diff --git a/MediaBrowser.Controller/Providers/DirectoryService.cs b/MediaBrowser.Controller/Providers/DirectoryService.cs
index 56b07ebae..5ab1e2798 100644
--- a/MediaBrowser.Controller/Providers/DirectoryService.cs
+++ b/MediaBrowser.Controller/Providers/DirectoryService.cs
@@ -62,9 +62,21 @@ namespace MediaBrowser.Controller.Providers
 
         public FileSystemMetadata? GetFile(string path)
         {
+            var entry = GetFileSystemEntry(path);
+            return entry != null && !entry.IsDirectory ? entry : null;
+        }
+
+        public FileSystemMetadata? GetDirectory(string path)
+        {
+            var entry = GetFileSystemEntry(path);
+            return entry != null && entry.IsDirectory ? entry : null;
+        }
+
+        public FileSystemMetadata? GetFileSystemEntry(string path)
+        {
             if (!_fileCache.TryGetValue(path, out var result))
             {
-                var file = _fileSystem.GetFileInfo(path);
+                var file = _fileSystem.GetFileSystemInfo(path);
                 if (file.Exists)
                 {
                     result = file;