[main.js] add missing checks for htmlNode

[pkra]

Fixes #288

[dpvc]

This looks OK, but I think that there may need to be one more change in order to handle requests for css when there is no request for html or htmlNode. You may want to move line 594 to the top of that function, right before line 566.

[pkra]

Ah! And I'm guessing

MathJax-node/lib/main.js

Line 687 in f1946b2

var renderer = ( (data.html || data.htmlNode) ? "CommonHTML" : "SVG");

needs to check for css as well so that typesetting happens with CHTML and the styles get generated, right?

[dpvc]

No, the styles are obtained just by loading the output jax, and that always happens. So you don't need to typeset using CHTML to get that. (I haven't tested that, but I'm pretty sure that's true.)

[pkra]

I haven't tested that, but I'm pretty sure that's true.

I've tested it and it fails for me, see #292. I think we should merge this and deal with the other issue separately.

[dpvc]

Since the fix for data.css is in the same line (687) as this change, I'd say doing as part of this PR would be reasonable.

[pkra]

In the interest of concise commits, can I go ahead and merge?

[dpvc]

OK, sure.