The profile creation feature was randomly breaking because the
occupation field sometimes was not filled.

That happened because of the way we selected an option of the occupation
list: we fetched all the options, and chose one randomly. The problem
was that the list of fetched options came with the placeholder that has
nil value. Therefore, sometimes we chose the nil value and used it to
submit the form. For we have a presence validation for the occupation
attribute, the test failed.

Now, we remove the first option of the fetched list before choosing an
occupation. Because the fetched options come on the same order defined
on the dropdown, the first option is always the one with the nil value.
Therefore, we won't submit the form without the occupation attribute set
correctly.

Signed-off-by: Heitor Reis <marcheing@gmail.com>