[BUG]: 4.0 RC: Unsupported MathJax version causes entire plot not to render #7926

Description

In plotly.js 4.0.0-rc.0, including an unsupported MathJax version on the page, and including a MathJax expression ('$...$') somewhere in the plot causes the entire plot not to render.

This is a regression, probably introduced by the transition from MathJax v2/v3 to v3/v4. Previously, in this situation, the plot would render normally but skipping MathJax rendering.

Screenshots/Video

See CodePen below. The whole plot is white so no point in putting a screenshot.

Steps to reproduce

CodePen demonstrating the issue