Merge pull request #662 from domcleal/validate-string-undef

Permit undef passed as `nil` to validate_string

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/puppet/parser/functions/validate_string.rb b/lib/puppet/parser/functions/validate_string.rb
index e92a2fc..0057fc1 100644
--- a/lib/puppet/parser/functions/validate_string.rb
+++ b/lib/puppet/parser/functions/validate_string.rb
@@ -30,7 +30,7 @@ module Puppet::Parser::Functions
     end
 
     args.each do |arg|
-      unless arg.is_a?(String)
+      unless arg.is_a?(String) || arg.nil?
         raise Puppet::ParseError, ("#{arg.inspect} is not a string.  It looks to be a #{arg.class}")
       end
     end