- bug fix: check that trees actually have a sym...
- bug fix: check that trees actually have a sym...

- bug fix: check that trees actually have a symbol before using it


lrytz/scala,slothspot/scala,lrytz/scala,lrytz/scala,scala/scala,martijnhoekstra/scala,shimib/scala,felixmulder/scala,slothspot/scala,martijnhoekstra/scala,shimib/scala,felixmulder/scala,slothspot/scala,slothspot/scala,jvican/scala,slothspot/scala,shimib/scala,lrytz/scala,felixmulder/scala,martijnhoekstra/scala,jvican/scala,scala/scala,lrytz/scala,jvican/scala,felixmulder/scala,jvican/scala,scala/scala,martijnhoekstra/scala,jvican/scala,scala/scala,felixmulder/scala,scala/scala,scala/scala,felixmulder/scala,martijnhoekstra/scala,jvican/scala,martijnhoekstra/scala,jvican/scala,shimib/scala,shimib/scala,shimib/scala,lrytz/scala,felixmulder/scala,slothspot/scala,slothspot/scala