If somebody has no plan to upgrade a module - we should not block

[hamrant]

Related Issue/Ticket:

#278 (review)

Steps to test:

• Check that migration of event demo content does not fail with error

Quality checks:

Please check these boxes to confirm this PR covers the following cases:

• Maintaining our upgrade path is essential. Check one or the other:
  • This PR provides updates via hook_update_N or other means.
  • No updates are necessary for this change.
• Front end fixes should be tested against all of the Open Y Themes.
  • Tested against Carnation
  • Tested against Lily
  • Tested against Rose
  • This change does not contain front-end fixes.
• I have flagged this PR "Needs Review" or pinged the VY devs/QA
  team in Slack

[fjbot]

Build 2753

Find the builds:
http://pr-280.openy-gated-content.sandbox-2.ci.fivejars.com
http://rose.pr-280.openy-gated-content.sandbox-2.ci.fivejars.com
http://lily.pr-280.openy-gated-content.sandbox-2.ci.fivejars.com
http://carnation.pr-280.openy-gated-content.sandbox-2.ci.fivejars.com
http://upgrade.pr-280.openy-gated-content.sandbox-2.ci.fivejars.com