[Zope] image inclusion: empty ALT not the same as no ALT

[J M Cerqueira Esteves]

Greetings

I just noticed a problem with the `tag' method:

If I insert an image with 

  <dtml-var "some_image.tag (border='0', alt='')">

(nice because `width' and `height' are inserted automatically), I get an
<img> element with NO `alt' attribute, instead of an `alt' atribute with
an empty string as its value (alt="").  

An empty `alt' value is important when using images for which it is best
not to insert any alternative text in text browsers (decoration-only or
redundant image links, for instance), because the absence of the `alt'
attribute may not be equivalent to an empty value.  In lynx, for example,
the file name of the image (more precisely, the last component of the
path in the `src' attribute) is shown (yuck) when no `alt' attribute is
supplied.

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