improve: dedicated error for no form selected in my forms

[florianm]

A tiny PR to emit a custom error message when a user forgot to select a form to open.

Other errors at form open output the error to the browser console and advise the user. This might be more informative than the "something's wrong" type generic error, or it might leak sensitive information in cases I haven't thought about - in the latter case we might not want to log the error to the browser console.

[lognaturel]

it might leak sensitive information in cases I haven't thought about

I have a hard time imagining what kind of sensitive info you might be thinking about. Like if the user's password is in an error in clear text or something?

[florianm]

I too have no concrete evidence of anything sensitive being leaked here. Struggling to reproduce the scenario where a form doesn't load to see what's in that error message.
Are you happy to console.log the error?

[lognaturel]

Maybe I'm not creative enough but I'm not thinking of anything sensitive that would be leaked. More likely is that the message would not be actionable. I probably would have included the error text directly in the dialog but this is fine.