Add ability to print alternative text instead of error message for rst :image: directive

[Timm638]

Is there an existing issue for this?

• I have searched the existing issues

Your suggestion

When rinohtype fails to render an image with an web url, it currently renders the error message into the pdf.

minimal_README.pdf
Source .rst: minimal_README.zip

I think that there should be an option to print the :alt: text of the image if one exists, since the HTML output of Sphinx does that:

I'm adding a pull request for a fork of mine, which implements this suggestion and produces following result:
minimal_README.pdf

[Timm638]

Closed, since the pull request #410 was merged.