Adding NULL:false constraint with change_column_null instead of change_column
What does this MR do?
Fixes "Migration db/post_migrate/20170516181025_add_constraints_to_issue_assignees_table.rb changes the type of columns, taking forever"
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Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added - Tests
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All builds are passing
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Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together