convert crashes when label is empty

[bnelson333]

ImageMagick version

6.9.10-23 Q16 x86_64 20190101

Operating system

Linux

Operating system, version and so on

Ubuntu Server 20.04

Description

Not sure if you know about this or if it's anything that needs fixing, but I have a use case where I need convert to create an image with an empty label. I found that when I include no text, it crashes. When I include null space, it runs fine. See examples in Steps to Reproduce.

Steps to Reproduce

This will cause a failure:
convert -background "#FFFFFF" -size 1920x1080 -fill "#000000" -pointsize 100 -gravity center label:'' test.jpg

Failure message:

convert-im6.q16: unable to open image convert': No such file or directory @ error/blob.c/OpenBlob/2874. convert-im6.q16: no decode delegate for this image format ' @ error/constitute.c/ReadImage/560.
convert-im6.q16: no images defined `test.jpg' @ error/convert.c/ConvertImageCommand/3258.

However, running the command as such will work, no error:
convert -background "#FFFFFF" -size 1920x1080 -fill "#000000" -pointsize 100 -gravity center label:'\n' test.jpg

Images

No response

[snibgo]

I need convert to create an image with an empty label.

You are using "label:", which creates an image with the required text. What image do you expect it to create when there is no text?

[dlemstra]

I would expect an error message to be shown when the label is an empty string.

[urban-warrior]

Thanks for the problem report. We can reproduce it and will have a patch to fix it in the GIT main branch @ https://github.com/ImageMagick/ImageMagick later today. The patch will be available in the beta releases of ImageMagick @ https://imagemagick.org/archive/beta/ by sometime tomorrow.