Remove NPE when `compileLate` sees sources during initialization.
Remove NPE when `compileLate` sees sources during initialization.

When a symbol needed in Definitions is loaded, it may be that the corresponding source is newer than
the classfile. That will send it to `compileLate`, but no phase is yet set. We simply add it to the 
compilation pipeline and continue gracefully.
slothspot/scala,jvican/scala,scala/scala,scala/scala,slothspot/scala,lrytz/scala,lrytz/scala,lrytz/scala,scala/scala,martijnhoekstra/scala,lrytz/scala,shimib/scala,felixmulder/scala,slothspot/scala,martijnhoekstra/scala,jvican/scala,jvican/scala,scala/scala,scala/scala,felixmulder/scala,martijnhoekstra/scala,shimib/scala,slothspot/scala,martijnhoekstra/scala,lrytz/scala,jvican/scala,felixmulder/scala,felixmulder/scala,shimib/scala,felixmulder/scala,felixmulder/scala,jvican/scala,slothspot/scala,shimib/scala,lrytz/scala,slothspot/scala,shimib/scala,jvican/scala,martijnhoekstra/scala,slothspot/scala,felixmulder/scala,martijnhoekstra/scala,shimib/scala,jvican/scala,scala/scala