Delete cache file in projectile-invalidate-cache

Previously the persistent invalidate path called
`(projectile-serialize nil ...)', leaving a four-byte file containing
the literal "nil" on disk.  Resolving the long-standing TODO: just
delete the file when invalidating, so the on-disk state matches the
intent of the command (and so an orphaned cache file isn't left
behind on uninstall).

0 files changed, 0 insertions, 0 deletions