be tolerant of no @domain_root_account for global includes
be tolerant of no @domain_root_account for global includes

refs CNVS-36971

Change-Id: Ia7a5e86b041f2a3360e46cf7f914557e1db6713e
Reviewed-on: https://gerrit.instructure.com/113674
Tested-by: Jenkins
Reviewed-by: Brent Burgoyne <bccf16d7abdd2611580b1cd7d7a6fcc150d619da@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

sfu/canvas-lms,venturehive/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms