[Petal] attributes question

[Jean-Michel Hiver]

> Just after sending that patch it struck me that there's no way to start with
> 
> <a petal:attributes="attr value"/>
> 
> and get
> 
> <a attr=""/>
> 
> because if the string is empty then you'll get
> 
> <a/>
> 
> Shouldn't this only happen when value is undef?

I can't think of an instance where that behavior would be useful.

The TAL spec states:

  If the expression associated with an attribute assignment evaluates to
  nothing, then that attribute is deleted from the statement element.

In Petal, I considered nothing to be either undef or an empty string.

Cheers,
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