Wrap uniform_answer_delay inside a try/finally clause
Wrap uniform_answer_delay inside a try/finally clause

This fixes the implementation done in: https://github.com/globaleaks/GlobaLeaks/commit/80e7fb2dd0d8680a11ccdba7a863eb0b30c86cf8

In case of exceptions (e.g. simply a wrong login) a raised exception was anyhow bypassing the uniform_answer_delay
so that the implementation was protecting only successful logins (relevant to passive attacks) but not on failed logins (relevant active attacks)

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