[manjaro] convert refuses to produce PDFs

Problem
Under Manjaro, I wanted to create a PDF from some JPG files. However, convert dropped an error:

$ convert *.jpg out.pdf
convert: attempt to perform an operation not allowed by the security policy `PDF' @ error/constitute.c/IsCoderAuthorized/408.

Solution
Edit the file /etc/ImageMagick-7/policy.xml and find the following line:

<policy domain="coder" rights="none" pattern="{PS,PS2,PS3,EPS,PDF,XPS}" />

Put it between comments (<!-- and -->) and everything is good again.

I found this solution here.