ADAP-1017: Fix configuration change monitoring for scenarios with no changes

[mikealfare]

resolves #1007

Problem

Users cannot recreate a materialized view if it does not have any changes. The configuration change collection is not being recognized as an empty set of changes.

Solution

The check currently looks for the existence of the config change collection instead of whether it has any changes. Update the check to look for the existence of changes instead of the object itself.

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX

[VersusFacit]

oh my.

Feel free to merge assuming we don't need a if config_change_collection and config_change_collection.has_changes style guard.

You know the method better than me, so act with that discretion.

test failures cropped up

[mikealfare]

assuming we don't need a if config_change_collection and config_change_collection.has_changes style guard.

Just to respond to this, config_change_collection is instantiated as an empty BigQueryMaterializedViewConfigChangeset, which has a has_changes calculated property.

[idoshamun]

@mikealfare @VersusFacit when do you expect to release it?
I'm eagerly waiting for this one 🙏

[yinkaihsu]

Also waiting for this release 🙏