Fixes.

 * Fixed error handling in `PromptIndex`.
 * Simplified `Prompt`.

Change-Id: 3966956bac
Story-Id: 79415340
Review fixes.

Story-Id: 79415340
Change-Id: 3093da9f9d
Use more idiomatic Go mapping.

Change-Id: 8bf28c014f
Story-Id: 79415340
Merge branch 'develop' of github.com:salsita/SalsaFlow into develop