Ignore unencrypted Base URI for encrypted documents

It can be a security vulnerability if the document is encrypted but the
Base URI is not, because if an attacker modified the document, they can
change the URI to point at their chosen location.

Issue #814
6 jobs for baseuri in 10 minutes and 4 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #1085199
build

00:03:09

passed #1085204
build_android

00:01:21

passed #1085200
build_clang_libcpp

00:03:13

passed #1085203
build_clazy

00:09:49

passed #1085202
build_mingw64_fedora

00:06:34

passed #1085201
build_ubuntu_16_04

00:10:03