Re: formencode.api.Invalid class lack __unicode__ method

Added in r3638 (I think if you use e.unpack_errors() it shouldn't have 
this problem, though)

Marcin Stępnicki wrote:
> I've noticed that error messages which are unicode objects give the
> following error when used in htmlfill:
> 
> UnicodeEncodeError: 'ascii' codec can't encode character u'\u0119' in
> position 5: ordinal not in range(128)
> 
> In rewritingparser.html_quote there is a fragment which checks if
> given object has __unicode__ attribute:
> 
> (...)
>    else:
>         if hasattr(v, '__unicode__'):
>             v = unicode(v)
> 
> but objects of  'formencode.api.Invalid' class don't have it, so the following:
> (...)
>    else:
>             v = str(v)
> 
> fails with UnicodeDecodeError.
> 
> Adding:
> 
>     def __unicode__(self):
>         val = self.msg
>         return val
> 
> to formencode.api.Invalid fixes the problem for me.

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