3rd party automation apps cannot be enabled if they were installed prior to Automation for Jira

Issue Summary

3rd party automation apps cannot be enabled if they were installed prior to Automation for Jira.

Steps to Reproduce

1. Install and start Jira Server 8.13.1
2. Clone and build the Atlassian 3rd party sample app from here: https://bitbucket.org/atlassian/automation-addon-sample/src/master/automation-thirdparty-sample/
3. Install the sample app JAR into Jira. An exception is thrown and the app becomes disabled.
4. Install Automation for Jira 7.2.1 app into Jira from here: https://marketplace.atlassian.com/download/apps/1215460/version/300003990
5. Try to enable the sample app. It hangs and won't enable.

Expected Results

The sample app can be enabled once Automation app is available.

Actual Results

The sample app cannot be enabled. It hangs for a while then remains disabled.

Workaround

A possible workaround is reinstalling the sample app, but this is still very confusing and frustrating for new customers.