no decode delegate for this image format

### Description
I have a `WriteableBitmap` and want to create a MagickImage from it. I added the WriteableBitmapEx Extensions and using the [ToByteArray](https://github.com/reneschulte/WriteableBitmapEx/blob/4f0ac0d06dce342aff7b5b4d1c7aa074802f334f/Source/WriteableBitmapEx/WriteableBitmapConvertExtensions.cs#L56) Method like this:

```
var image = new MagickImage(Image.ToByteArray())
```
it does throw

```
ImageMagick.MagickMissingDelegateErrorException
HResult=0x80131500
Nachricht = no decode delegate for this image format `' @ error/blob.c/BlobToImage/458
Quelle = Magick.NET-Q8-x64
Stapelüberwachung:
at ImageMagick.NativeInstance.CheckException(IntPtr exception, IntPtr result)
at ImageMagick.MagickImage.NativeMagickImage.ReadBlob(MagickSettings settings, Byte[] data, Int32 offset, Int32 length)
at ImageMagick.MagickImage.Read(Byte[] data, Int32 offset, Int32 length, MagickReadSettings readSettings, Boolean ping)
at ImageMagick.MagickImage.Read(Byte[] data, MagickReadSettings readSettings)
at ImageMagick.MagickImage..ctor(Byte[] data)
```
### System Configuration

- Magick.NET version: Magick.NET-Q8-x64
- Environment (Operating system, version and so on): win10