Bug 10177 - whitespace is a valid password causing pernicious perturbations.

Bug 10177 - whitespace is a valid password causing pernicious perturbations.

Test plan:
Go to your patron, go to change username and/or password. change
password to whitespace, notice it is accepted, apply this patch,
change password again, to whitespace, notice password is not valid.

Followed test plan. Patch behaves as expected.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>