Fixes bug 1396607 - Fix error when a user has no contributions yet. (#699)
Fixes bug 1396607 - Fix error when a user has no contributions yet. (#699)

Is a logged in user with no contributions to any locales tries to load the home page, it raises a 500 error. That is a regression, and is fixed by this commit.
mathjazz/pontoon,mozilla/pontoon,mozilla/pontoon,jotes/pontoon,mastizada/pontoon,mozilla/pontoon,jotes/pontoon,jotes/pontoon,jotes/pontoon,mathjazz/pontoon,mastizada/pontoon,mastizada/pontoon,mastizada/pontoon,mathjazz/pontoon,mathjazz/pontoon,mozilla/pontoon,mathjazz/pontoon,mozilla/pontoon