[FIX] added a guard to edit operator --require-signing-key to ensure that operator has at least one signing key before setting it
[FIX] added a guard when removing signing keys from the operator that require signing key is not set [FIX] added better messages in cases where a signing key is required because of --require-signing-key option when adding users
[FIX] added a guard to edit operator --require-signing-key to ensure that operator has at least one signing key before setting it
[FIX] added a guard when removing signing keys from the operator that require signing key is not set [FIX] added better messages in cases where a signing key is required because of --require-signing-key option when adding users
Fixes #628