airbrake/airbrake — pull request #240 by ahmadsherif (2013-08-28 12:00:16+00:00)
Title: Don't serialize nil to an empty string

Suppose we have such parameters passed `[nil, '', nil]` to a notice, it will get reported on Airbrake like this `"[\"\", \"\", \"\"]"`, which could be misleading 'cause the nils were serialized to empty strings, this PR solves this issue.