selfSignedServerCert_SHA1_RSA_2048: nullify output variables on failure.
selfSignedServerCert_SHA1_RSA_2048: nullify output variables on failure.

This commit ensures that we assign a null-valued QSslCertificate and
QSslKey on failure.

Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble,Lartza/mumble