[Petal] [Patch] prevent repeated evaluation of expression in _attr

[Fergal Daly]

current Petal turns

petal:attributes="a b"

into


    if (defined $hash->get ('b') and $hash->get ('b') ne '') {
        $res .= "a" . '="' . $hash->get ('b') . '"'
    }

This makes Petal 3 gets for the same expression.

The patch changes it to

    {
        my $value = $hash->get ('b');
        if (defined($value) and length($value)) {
            $res .= "a=\"$value\""
        }
    }

which is a little messier but only does 1 get.

F
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