Reporting errors from _repr_<type>_ methods

[lgautier]

Hi,

Reporting errors from methods such as _repr_png(), _repr_html(), etc... would be extremely helpful.

Currently the error are silently ignored:

• a user is not informed that something unexpected happened
• a user is unable to report information about what went wrong

L.

[minrk]

it probably shouldn't raise, but a warning would definitely be better than silence.

[lgautier]

I am guessing that that rationale for not raising is that the error is coming from the code the user did not explicit called, but a warning would already be a way to report that something is happening.

I'd argue that there should still be a way to raise an exception (even if only for development / debugging - this can be a debug switch somewhere).

[ellisonbg]

@mink do you consider this fixed by your recent formatter work?

[minrk]

Yes, I didn't remember there being an open issue. Definitely fixed now.