Test, if the other instructions are blocked in opt:value

>>>>templates/test.tpl
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<opt:root>
<foo>
<opt:attribute name="class" str:value="c">
	<opt:value test="$val1 == 'foo'">a <opt:section name="foo">...</opt:section> bar</opt:value>
	<opt:value test="$val1 == 'bar'">b</opt:value>
	<opt:value>c</opt:value>
</opt:attribute>
</foo>
</opt:root>

>>>>data.php
$view->val1 = 'foo';
$view->val2 = 'bar';
$view->val3 = 'joe';

>>>>expected.txt
Opt_InvalidValue_Exception