Add a message to the UserError raised when trying to do a Dir lookup with create=False.  Should not normally happen, but it did to me, and it is better to have some explanatory message when it happens rather than failing silently.
Add a message to the UserError raised when trying to do a Dir lookup with create=False.  Should not normally happen, but it did to me, and it is better to have some explanatory message when it happens rather than failing silently.

Distrotech/scons,Distrotech/scons,Distrotech/scons,Distrotech/scons,Distrotech/scons