The Generator::State::op_href returns a raw java null when the given attribute is missing

[jvshahid]

Although the returned value compares to nil perfectly because JRuby do the conversion behind the scenes, calling anything on the returned object will cause a null pointer exception to be thrown.

This pull request includes a test to demonstrate the error and a fix for it.

[jvshahid]

ping. is there anything stopping this pr from being merged ?

[edzhelyov]

👍 Please merge this PR.

1.7.6 doesn't fix the nullPointerException as you can test that with the following code

gem 'json', '=1.7.6'
require 'active_support/all'

puts JSON::VERSION

h = { a: 1 }
puts JSON.dump(h)

hi = HashWithIndifferentAccess.new(h)
puts JSON.dump(hi)

[flori]

This problem is now fixed in the current master, so you can check it out.