Return error with missing field for movie files endpoint

Fixes #10555

src/Radarr.Api.V3/MovieFiles/MovieFileController.cs

@@ -172,6 +172,11 @@ namespace Radarr.Api.V3.MovieFiles
         [Consumes("application/json")]
         public object DeleteMovieFiles([FromBody] MovieFileListResource resource)
         {
+            if (!resource.MovieFileIds.Any())
+            {
+                throw new BadRequestException("movieFileIds must be provided");
+            }
+
             var movieFiles = _mediaFileService.GetMovies(resource.MovieFileIds);
             var movie = _movieService.GetMovie(movieFiles.First().MovieId);
 

src/Radarr.Api.V3/MovieFiles/MovieFileListResource.cs

@@ -6,7 +6,7 @@ namespace Radarr.Api.V3.MovieFiles
 {
     public class MovieFileListResource
     {
-        public List<int> MovieFileIds { get; set; }
+        public List<int> MovieFileIds { get; set; } = new ();
         public List<Language> Languages { get; set; }
         public QualityModel Quality { get; set; }
         public string Edition { get; set; }