CTAN license badge is broken

[paternal]

URL https://img.shields.io/ctan/l/tex.png produces this:

I think the problem is from ctan. Their API might have changed since you wrote the code for this badge, and it no longer contains copyright information. For instance (stripped to the interesting bit):

$ curl http://www.ctan.org/json/pkg/tex | python -m json.tool
{
    ...
    "copyright": [],
    ...
}

[paulmelnikow]

Hi, thanks for reporting this issue.

The problem seems to be specific to the tex package:

http://ctan.org/json/pkg/novel <-- has license
http://ctan.org/json/pkg/libertine <-- has license
http://ctan.org/json/pkg/tex <-- empty license

I see http://ctan.org/pkg/tex lists the Knuth License. A custom license, I suppose.

Would you like to reach out to CTAN about it?

I don't like 'undefined' showing up on a badge, so I opened #922 to improve the CTAN error handling.

[paternal]

Would you like to reach out to CTAN about it?

Sorry, I cannot do this (I have a baby at home, and I barely have enough time to do the chores; unfortunately, reporting a few issue here and there is the only way I can contribute to free software these days).

-- Louis