Rails5: fix operations controller spec nil parameter
What does this MR do?
Rails 5 converts nil in spec params to ''. There is no way to send a real nil param outside of the specs. A change too '' fixes this spec for rails 5.
Fixes ee/spec/controllers/operations_controller_spec.rb:190
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Conforms to the code review guidelines -
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Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process. -
EE specific content should be in the top level /eefolder -
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