update a/r calculation

Emby.Server.Implementations/Dto/DtoService.cs

@@ -1582,16 +1582,21 @@ namespace Emby.Server.Implementations.Dto
 
             ImageSize size;
 
-            if (supportedEnhancers.Count == 0)
-            {
             var defaultAspectRatio = item.GetDefaultPrimaryImageAspectRatio();
 
             if (defaultAspectRatio.HasValue)
+            {
+                if (supportedEnhancers.Count == 0)
                 {
                     return defaultAspectRatio.Value;
                 }
-            }
 
+                double dummyWidth = 200;
+                double dummyHeight = dummyWidth / defaultAspectRatio.Value;
+                size = new ImageSize(dummyWidth, dummyHeight);
+            }
+            else
+            {
                 try
                 {
                     size = _imageProcessor.GetImageSize(imageInfo);
@@ -1601,6 +1606,7 @@ namespace Emby.Server.Implementations.Dto
                     //_logger.ErrorException("Failed to determine primary image aspect ratio for {0}", ex, path);
                     return null;
                 }
+            }
 
             foreach (var enhancer in supportedEnhancers)
             {