modules installed by r10k are not removed when removed from Puppetfile if Puppetfile contains no other modules

[jessereynolds]

Steps to reproduce:

• have stdlib as the only module in your Puppetfile and use one of its functions eg fact()
• do a run spec and witness tests passing
• remove stdlib from your Puppetfile, so there's no modules listed at all
• do a run spec

Expected result:

• test failure due to stdlib being missing

Actual result:

• tests keep passing because stdlib module still resides at:
  .onceover/etc/puppetlabs/code/environments/production/modules/stdlib
  with a symlink to that dir at:
  .onceover/spec/fixtures/modules/stdlib

In fact, the debug run still shows it is faithfully maintaining that symlink too:

DEBUG -> Symlinking /Users/jesse/src/puppet/gems/onceover/tmp/control-repos/simple/.onceover/etc/puppetlabs/code/environments/production/modules/stdlib to /Users/jesse/src/puppet/gems/onceover/tmp/control-repos/simple/.onceover/spec/fixtures/modules/stdlib

[jessereynolds]

This is caused by puppetlabs/r10k#762