fix(multisig): reject zero-member identity/verifier to close anyone-can-spend bypass#1859

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mainLFDT-Panurus/panurus:mainfrom

1858-zero-length-multiidentity-yields-vacuously-true-verify-anyone-can-spend-outputLFDT-Panurus/panurus:1858-zero-length-multiidentity-yields-vacuously-true-verify-anyone-can-spend-outputCopy head branch name to clipboard