Fixed: Zero length file causes MediaInfo hanging in 100% cpu load. (#1340)

src/NzbDrone.Core/MediaFiles/MediaInfo/MediaInfoLib.cs

@@ -189,6 +189,11 @@ namespace NzbDrone.Core.MediaFiles.MediaInfo
 
         public int Open(Stream stream)
         {
+            if (stream.Length < 1024)
+            {
+                return 0;
+            }
+
             var isValid = (int)MediaInfo_Open_Buffer_Init(_handle, stream.Length, 0);
             if (isValid == 1)
             {