"Problem Running Couchbase" error dialog if app not in /Applications folder

Steps to reproduce:

1. Move Couchbase Server.app to somewhere other than /Applications
2. Launch Couchbase Server.app

Expected result:

One of

1. It starts.
2. It offers to move itself to /Applications and then starts.
3. It fails to start, but displays an error message instructing the user to move it to /Applications

Actual result:

Error dialog with Couchbase icon and the unhelpful message:

Problem Running Couchbase
Couchbase Server doesn't seem to be operating properly. Check Console logs for more details.

Console log filtered by "couchbase" is attached. 

Reproducible with these distributions (and possibly others):

couchbase-server-community_4.5.1-macos_x86_64
{{ couchbase-server-enterprise_4.6.0-DP-macos_x86_64}}
{{ couchbase-server-enterprise_5.0.0-beta2-macos_x86_64}}