add helper method for incomplete registration
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 <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Drew Bowman <43bd25f9469d5056946537962fe98ec04e66c401@instructure.com>
QA-Review: Drew Bowman <43bd25f9469d5056946537962fe98ec04e66c401@instructure.com>
Product-Review: Drew Bowman <43bd25f9469d5056946537962fe98ec04e66c401@instructure.com>
QA-Review: Steven Shepherd <e794458448443812fb2685675aab3bbd1a3891bc@instructure.com>
Reviewed-by: Joel Hough <4816dabf8db1bc6cac35b3a24cab2ff844b5b0c7@instructure.com>

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