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    Fix #360 - do not allow setting an empty fingerprint through `SET-FINGERPRINT` · c52b970d
    ng authored
    Check for a valid fingerprint as argument and do not accept an empty
    fingerprint. This will not anymore allow to unset a fingerprint
    through the `SET-FINGERPRINT`. This functionality will be superseeded
    by another keyword.
    
    As part of that fix, wie centralize checking for a valid fingerpint
    and constrain the check to be either 32 (v3) or 40 (v4) characters
    long.
    c52b970d