useview_telemetry fails when app version is not available on telemetry record.

[1yuv]

Materialized view doesn't get created or fails if app version is not available in telemetry data.

useview_telemetry creates date based on the app version to handle different formatting used before 3.8 and later. However, if a telemetry log doesn't have app version, then date can not be created and it fails.

One of the incident we noticed was here. This one was fixed by adding following condition here

 AND doc#>>'{metadata,versions,app}' IS NOT NULL;

We may need to update default query with similar condition or handle in some other ways.

[derickl]

You could potentially also resolve this by adding the null check in the case...when block