Stub out pkgState with non-error, helps with debugging.
Summary: When we use -dppr-debug, we'll sometimes attempt to hit the pkgState to give more detailed information. It's pretty annoying to have this fail because we haven't filled in the pkgState: we can still get useful debugging information by printing the raw package key. To avoid this, we just put in some empty stub pkgState, to be filled in later. Signed-off-by: Edward Z. Yang <email@example.com> Test Plan: validate Reviewers: simonpj, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D817