### ImageMagick version

7.1.1.21

### Operating system

MacOS

### Operating system, version and so on

OSX Ventura

### Description

**Hough Lines to MVG Gives warning message**

(I know that I can suppress it with -quiet. But why the message if the file is created)


Input:

![quad1_hull_outline](https://github.com/ImageMagick/ImageMagick/assets/13458218/8ad156af-cd23-4bb7-93f1-2da1630f2d4c)

`magick quad1_hull_outline.png -hough-lines 9x9+$hthresh2 quad1_hull_lines.mvg`
magick: no encode delegate for this image format `' @ warning/constitute.c/WriteImage/1399.

**However, the MVG file is created**

[quad1_hull_lines.mvg.zip](https://github.com/ImageMagick/ImageMagick/files/13326352/quad1_hull_lines.mvg.zip)


### Steps to Reproduce

See above

### Images

See above
Hough Lines to MVG Gives warning message
This is a GitHub Issue
repo:ImageMagick
owner:ImageMagick
Title : Hough Lines to MVG Gives warning message
Issue date:

--- start body ---
### ImageMagick version

7.1.1.21

### Operating system

MacOS

### Operating system, version and so on

OSX Ventura

### Description

**Hough Lines to MVG Gives warning message**

(I know that I can suppress it with -quiet. But why the message if the file is created)


Input:

![quad1_hull_outline](https://github.com/ImageMagick/ImageMagick/assets/13458218/8ad156af-cd23-4bb7-93f1-2da1630f2d4c)

`magick quad1_hull_outline.png -hough-lines 9x9+$hthresh2 quad1_hull_lines.mvg`
magick: no encode delegate for this image format `' @ warning/constitute.c/WriteImage/1399.

**However, the MVG file is created**

[quad1_hull_lines.mvg.zip](https://github.com/ImageMagick/ImageMagick/files/13326352/quad1_hull_lines.mvg.zip)


### Steps to Reproduce

See above

### Images

See above
--- end body ---
