🐛 Source Google Analytics v4: Fix validation of empty custom reports issue

[lazebnyi]

What

#5652 - Source Google Analytics v4: custom_report is not a param in spec.json

How

Add validation of empty custom reports issue.

Recommended reading order

1. x.java
2. y.python

Pre-merge Checklist

Expand the relevant checklist and delete the others.

New Connector

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• Code reviews completed
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  • docs/integrations/README.md
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Updating a connector

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• Unit & integration tests added and passing. Community members, please provide proof of success locally e.g: screenshot or copy-paste unit, integration, and acceptance test output. To run acceptance tests for a Python connector, follow instructions in the README. For java connectors run ./gradlew :airbyte-integrations:connectors:<name>:integrationTest.
• Code reviews completed
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  • Connector's README.md
  • Changelog updated in docs/integrations/<source or destination>/<name>.md including changelog. See changelog example
• PR name follows PR naming conventions
• Connector version bumped like described here

Airbyter

If this is a community PR, the Airbyte engineer reviewing this PR is responsible for the below items.

• Create a non-forked branch based on this PR and test the below items on it
• Build is successful
• Credentials added to Github CI. Instructions.
• /test connector=connectors/<name> command is passing.
• New Connector version released on Dockerhub by running the /publish command described here

Connector Generator

• Issue acceptance criteria met
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• Documentation which references the generator is updated as needed.

[lazebnyi]

/test connector=connectors/source-google-analytics-v4

🕑 connectors/source-google-analytics-v4 https://github.com/airbytehq/airbyte/actions/runs/1168218530
✅ connectors/source-google-analytics-v4 https://github.com/airbytehq/airbyte/actions/runs/1168218530

[marcosmarxm]

LGTM thanks @lazebnyi

[lazebnyi]

/publish connector=connectors/source-google-analytics-v4

🕑 connectors/source-google-analytics-v4 https://github.com/airbytehq/airbyte/actions/runs/1168245525
✅ connectors/source-google-analytics-v4 https://github.com/airbytehq/airbyte/actions/runs/1168245525