check if an argument supposed to be merged is empty to

pass over undefs without failing

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/puppet/parser/functions/merge.rb b/lib/puppet/parser/functions/merge.rb
index 6ec085e..54d1c1c 100644
--- a/lib/puppet/parser/functions/merge.rb
+++ b/lib/puppet/parser/functions/merge.rb
@@ -22,6 +22,7 @@ module Puppet::Parser::Functions
     accumulator = Hash.new
     # Merge into the accumulator hash
     args.each do |arg|
+      next if arg.empty? # empty string is synonym for puppet's undef
       unless arg.is_a?(Hash)
         raise Puppet::ParseError, "merge: unexpected argument type #{arg.class}, only expects hash arguments"
       end