replaced old reference to dummy by pre-checks
replaced old reference to dummy by pre-checks

svn path=/trunk/StrategoXT/; revision=148

lichtemo/strategoxt,Apanatshka/strategoxt,Apanatshka/strategoxt,metaborg/strategoxt,metaborg/strategoxt,metaborg/strategoxt,lichtemo/strategoxt,lichtemo/strategoxt,Apanatshka/strategoxt,Apanatshka/strategoxt,lichtemo/strategoxt,metaborg/strategoxt,metaborg/strategoxt,Apanatshka/strategoxt,lichtemo/strategoxt