unset parameter affects following template invocation

execute the attached example and toggle the error message

sometimes (~50% of the time) the css class of the first textbox is not updated properly when toggling the error message.

after refreshing the page it either works or keeps failing

see http://screencast.com/t/pmK2vXill

the problem can be worked around in 2 ways, either always set the "error" parameter when invoking the formGroup template, or removing the surrounding <sh:apply>