Unprotected file raising FileFormatError instead of returning False when checked with is_encrypted()

[it-sanwa-ei]

import msoffcrypto

protected = './protected.xlsx'
unprotected = './unprotected.xlsx'
password = '12345'

file = open(protected, 'rb')
ms_file = msoffcrypto.OfficeFile(file).is_encrypted()
print(ms_file)

This return

True

, but when I try

file = open(unprotected, 'rb')
ms_file = msoffcrypto.OfficeFile(file).is_encrypted()
print(ms_file)

This give me

FileFormatError: Unencrypted document or unsupported file format

instead of False

[nolze]

Fixed in d0383c8 and released v5.1.0. Thank you for reporting!