[Petal] omit-tag bug

[Jean-Michel Hiver]

> The spec says omit-tag="" should always omit the tag, so the following should 
> disappear

Ooops, bug :)

This was ridiculously easy to fix and I added a test for it.


I replaced every instance of:

    my $expression = $att->{"$petal:omit-tag"};

With:

    my $expression = $att->{"$petal:omit-tag"} = 'string:1';

:-)


Unfortunately PAUSE has been down for a few days so I am unable to
upload Petal 1.06 right now :/

Cheers,
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Jean-Michel Hiver
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