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When validate_string is called via the Puppet 4 deprecation wrappers
from deprecation_gen (introduced in 970852d), `undef` is passed as `nil`
where it was previously passed as `''` from the Puppet 3-style function
API.
This change explicitly permits a `nil` value in validate_string, and
adds a test case to `is_string` which also accepts the same.
Fixes test failures in apt, concat etc:
Error while evaluating a Function Call, nil is not a string. It looks to be a NilClass at apt/manifests/source.pp:23:3 [..]
# ./spec/fixtures/modules/stdlib/lib/puppet/parser/functions/validate_string.rb:34:in `block (2 levels) in <module:Functions>'
# ./spec/fixtures/modules/stdlib/lib/puppet/parser/functions/validate_string.rb:32:in `each'
# ./spec/fixtures/modules/stdlib/lib/puppet/parser/functions/validate_string.rb:32:in `block in <module:Functions>'
# puppet-4.7.0/lib/puppet/parser/functions.rb:174:in `block (2 levels) in newfunction'
# puppet-4.7.0/lib/puppet/util/profiler/around_profiler.rb:58:in `profile'
# puppet-4.7.0/lib/puppet/util/profiler.rb:51:in `profile'
# puppet-4.7.0/lib/puppet/parser/functions.rb:167:in `block in newfunction'
# ./spec/fixtures/modules/stdlib/lib/puppet_x/puppetlabs/stdlib/deprecation_gen.rb:13:in `block (2 levels) in deprecation_gen'
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