catch nil inputs on signFileAtPath:writeSignatureToFile:detached:
catch nil inputs on signFileAtPath:writeSignatureToFile:detached:

FAU-Inf2/unnetpgp,upnext/unnetpgp,upnext/unnetpgp,upnext/unnetpgp,FAU-Inf2/unnetpgp,FAU-Inf2/unnetpgp,upnext/unnetpgp