Search for empty formfield

Hi,
I've tried many things already, but I just can't find what I need. Next, I want to inclue it into a search result, which always produces a mess (probably because I'm confusign the use of the " and the $quot symbols.)

Question: How can I search for empty fields in a form?

It works somehow in my WebLeftbar

%IF{
"istopic 'NL.%FORMFIELD{"NederlandsTopicName" topic="%BASEWEB%.%BASETOPIC%" default="empty" alttext="alt"}%'"
then="[[NL.%FORMFIELD{"NederlandsTopicName" topic="%BASEWEB%.%BASETOPIC%" default="empty" alttext="alt"}%][%FORMFIELD{"NederlandsTopicName" topic="%BASEWEB%.%BASETOPIC%" default="empty" alttext="alt"}%]]" 
else="[[NL.Hoofdpagina][%MAKETEXT{"Hoofdpagina"}%]]"
}%

But how can Include that into my search results (i.e. diaplayed in the format-line)?

What I like to have here is IF $topic-formfield(blabla)= empty THEN $topic

%SEARCH{
   "NederlandsTopicName"
   excludetopic="*Template,Web*,*Form"
   type="query"
   web="En"
   header="|*Bron*|*Engels*|*Nederlands*|" 
   format="$percentIF{$quotistopic '$formfield(NederlandsTopicName)'$quot then=$quot<nop>$quot else=$quot|[[En.$topic?raw=on][Brontekst kopieeren]]|[[En.$topic][$topic]]|[[$formfield(NederlandsTopicName)]]|$quot}$percent"
   nonoise="on"
   nototal="on"
   order="topic"
}%

I guess that's asimple step for you experts, I am not an expert :-)

-- LieVen - 15 Aug 2014