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Consolidate NullPIN checks

Description

Consolidate NullPIN checks

Move hasNKSNullPin() and hasSigGNullPin() from NetKeyCard to Card.
Remove unneeded Card::hasNullPin() and Card::setHasNullPin().

(cherry picked from commit 125aacf3bb0e0cd49f4b1c40379de3969131ec26)