(Release) Better Error Handling

[mjhamrick]

The Data Studio Developer Relations team is excited to announce better error handling for community connectors via the Data Studio Apps Script Service.

If you have created connectors in the past, you should migrate to use the library for throwing errors as you have time. For the time being, the legacy return values will still be supported. DS_USER is now deprecated and will no longer work after June 2019.

The Error Handling and Debug guides have been updated to reflect the new functionality.

This pull request shows an example of migrating from the legacy value to the Apps Script service.

Happy Coding,

Matt