Remove commented out raise

One of the conditions for raising an argument error was commented out in
2014 as part of 2f8428c. The Rubocop Layout/LeadingCommentSpace cop
flagged this as an issue but, instead of resolving the cop, this
commit removes the comment entirely.

Author: mhashizume

lib/puppet/syntax_checkers/json.rb

@@ -19,8 +19,6 @@ def check(text, syntax, acceptor, source_pos)
     raise ArgumentError.new(_("Json syntax checker: the syntax identifier must be a String, e.g. json, data+json")) unless syntax.is_a?(String)
     raise ArgumentError.new(_("Json syntax checker: invalid Acceptor, got: '%{klass}'.") % { klass: acceptor.class.name }) unless acceptor.is_a?(Puppet::Pops::Validation::Acceptor)
 
-    #raise ArgumentError.new("Json syntax checker: location_info must be a Hash") unless location_info.is_a?(Hash)
-
     begin
       Puppet::Util::Json.load(text)
     rescue => e