Update PasswordRecoveryService to check if the user exist before send…

[Sara23]

… email.

Q	A
Is bugfix?	yes
New feature?	yes
Breaks BC?	no
Fixed issues	Check if the user exist before send email.

[maxxer]

Why this change? Can't you trap RuntimeException and handle the error in the application, can you?

[TonisOrmisson]

I do not like the mechanics of being able to check if an user exists or not. I think the default "blind" way is good and should not be changed unless any serious arguments are presented.

[maxxer]

Agree with @TonisOrmisson. If you want this change to be merged, it should be controlled by a configuration parameter, but the default behavior must be the current one.