`TypeError` when setting a non-existent theme

[feightwywx]

Describe the bug

I'm trying to migrate readme cards to my own instance, which are set up long time a ago. I used &theme=light at that time, and stuck into this:

TypeError: Cannot use 'in' operator to search for 'border_color' in undefined
    at getCardColors (file:///var/task/src/common/color.js:92:20)
    at renderError (file:///var/task/src/common/render.js:156:59)
    at Object.default [as handler] (file:///var/task/api/index.js:140:9)
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    at async r (/opt/rust/nodejs.js:2:15572)
    at async Server.<anonymous> (/opt/rust/nodejs.js:2:11594)
    at async Server.<anonymous> (/opt/rust/nodejs.js:17:9988)

After removing &theme=light, everything went right. I think the reason is, among this long time, light theme was replaced with default, and setting a theme which doesn't exist caused this problem.

Expected behavior

A more friendly notice, or just fall back to default, i think?

Screenshots / Live demo link

Additional context

No response

[martin-mfg]

This is a duplicate of #4641, which has been resolved in https://github.com/stats-organization/github-readme-stats.

For context please see #3851 (comment).