Allow empty old password in SD with Yubi
Allow empty old password in SD with Yubi

Otherwise it's impossible to change from an empty
to a non-empty passphrase with SD and Yubikey.

Sp1l/pwsafe,ronys/pwsafe-test,Sp1l/pwsafe,Sp1l/pwsafe,sorinAche23/Psafe,gpmidi/pwsafe,gpmidi/pwsafe,gpmidi/pwsafe,ronys/pwsafe-test,ronys/pwsafe-test,ronys/pwsafe-test,sorinAche23/Psafe,sorinAche23/Psafe,Sp1l/pwsafe,gpmidi/pwsafe,sorinAche23/Psafe,gpmidi/pwsafe,Sp1l/pwsafe,ronys/pwsafe-test,ronys/pwsafe-test,sorinAche23/Psafe,ronys/pwsafe-test,Sp1l/pwsafe,sorinAche23/Psafe,Sp1l/pwsafe,gpmidi/pwsafe,Sp1l/pwsafe,ronys/pwsafe-test,sorinAche23/Psafe,gpmidi/pwsafe,sorinAche23/Psafe,gpmidi/pwsafe