add helper method for incomplete registration

fixes CNVS-13526

test plan:
- test along with the demo site changes
- this is needed to verify the demo site tracking pixel changes

Change-Id: Ice12d7248e75e24c3694d3df5cccda7e8ba18881
Reviewed-on: https://gerrit.instructure.com/36972
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Drew Bowman <dbowman@instructure.com>
QA-Review: Drew Bowman <dbowman@instructure.com>
Product-Review: Drew Bowman <dbowman@instructure.com>
QA-Review: Steven Shepherd <sshepherd@instructure.com>
Reviewed-by: Joel Hough <joel@instructure.com>