Issue Summary

When viewing a file in source view, if a branch is not loaded, meaning you are viewing it on the commit, then clicking "Checkout" generates a "Something went wrong error".

This is because, it's expecting a branch to be loaded but if you are viewing from the commit and no branch is loaded, then it generates this error as it can't find a branch to add to this checkout command.

Steps to Reproduce

1. Click on commits tab on your repository
2. Open any of the older commits and click "view file" on one of the files
   • At this point you are viewing the file from the commit but it's not referenced to any branch.
3. Click checkout on the top left

Expected Results

Clicking checkout shows a pop up with the git checkout commands

Actual Results

Clicking checkout shows an error "Something went wrong".

Workaround

To workaround this, you can select a branch from the branch drop down (which has this file) on the branch. Then only click checkout.

Alternatively, before clicking checkout, add a branch which contains this file to the URL :

https://bitbucket.org/<workspaceid>/<repo>/src/<commit>/<file>?at=master