I noticed, using SQLFORM.grid, that I get occasional empty class attributes,
something like <th class>foo</th>. I assume that this is a consequence of calls
like this one:
head.append(TH(header, _class=ui.get('default','')))
It'd be nice, though probably not critical, to fix that, but it's a subtle
problem. Stripping all attributes with empty values is likely to cause
behavioral changes, since there are attributes (I forget which ones at the
moment) that have effect without having values. It does seem worth a little
effort, though, to clean up what we can.
Maybe XML() (or wherever) could have a frozenset of attribute names that should
be suppressed if they come without values?
