[bug] puppet lint error when there are no manifest files

[GeoffWilliams]

When there are no puppet manifests we get an error like this:

geoff@computer:~/github/puppet-windows_firewall$ make fast
cd .pdqtest && bundle exec pdqtest fast
Entered PDQTest from /home/geoff/github/puppet-windows_firewall/.pdqtest
---> syntax:manifests
---> syntax:templates
---> syntax:hiera:yaml
puppet-lint: no file specified or specified file does not exist
puppet-lint: try 'puppet-lint --help' for more information
fastcheck (syntax+lint): 💣
Error encountered running #<Proc:0x000055c7da5be990@/home/geoff/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/pdqtest-2.0.5/exe/pdqtest:144 (lambda)>
Overall: 💩

Cause

no puppet manifests to scan so they cant be scanned

Workaround

geoff@computer:~/github/puppet-windows_firewall$ mkdir manifests
geoff@computer:~/github/puppet-windows_firewall$ touch manifests/init.pp
geoff@computer:~/github/puppet-windows_firewall$ make fast
cd .pdqtest && bundle exec pdqtest fast
Entered PDQTest from /home/geoff/github/puppet-windows_firewall/.pdqtest
---> syntax:manifests
---> syntax:templates
---> syntax:hiera:yaml
fastcheck (syntax+lint): 😬
I'm downloading The Internet, please hold... 🐌
examples to run[]
No acceptance tests found, annotate examples with @PDQTest to make some
overall acceptance test status=true
Overall: 😎