Import from BitBucket Cloud gives error
### Summary
Importing a new project from BitBucket causes errors.
### Steps to reproduce
New Project >> Import >> BitBucket >> Login >> Import Projects
Gives the flash warning: An error occurred while importing project
### What is the current *bug* behavior?
Importing from BitBucket gives errors.
### What is the expected *correct* behavior?
It should import.
### Relevant logs and/or screenshots
[Kibana Log returns 422](https://kibana.gprd.gitlab.com/app/kibana#/doc/AWHZupZCt3yjxWZWlv3e/production-2018.04.25/production?id=AWL--A9LUD2NydxyaK2N&_g=(refreshInterval:(display:Off,pause:!f,value:0),time:(from:now%2Fw,mode:quick,to:now%2Fw)))
### Output of checks
This bug happens on GitLab.com
#### Results of GitLab environment info
`GitLab Enterprise Edition 10.7.1-ee d209ff1`
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