Fix PP of if-then-else.
Fix PP of if-then-else.

svn path=/strategoxt/trunk/; revision=15432

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