🐛 Source Zendesk Chat: 'created_at' can be null for old items

[grubberr]

Signed-off-by: Sergey Chvalyuk grubberr@gmail.com

What

https://developer.zendesk.com/api-reference/live-chat/chat-api/bans/#json-format
created_at - This can be null for older bans.

How

Describe the solution

Recommended reading order

1. x.java
2. y.python

🚨 User Impact 🚨

Are there any breaking changes? What is the end result perceived by the user? If yes, please merge this PR with the 🚨🚨 emoji so changelog authors can further highlight this if needed.

Pre-merge Checklist

Expand the relevant checklist and delete the others.

Updating a connector

Community member or Airbyter

• Grant edit access to maintainers (instructions)
• Secrets in the connector's spec are annotated with airbyte_secret
• 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
• Documentation updated
  • Connector's README.md
  • Connector's bootstrap.md. See description and examples
  • Changelog updated in docs/integrations/<source or destination>/<name>.md including changelog. See changelog example
• PR name follows PR naming conventions

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
• After the new connector version is published, connector version bumped in the seed directory as described here
• Seed specs have been re-generated by building the platform and committing the changes to the seed spec files, as described here

[grubberr]

/test connector=connectors/source-zendesk-chat

🕑 connectors/source-zendesk-chat https://github.com/airbytehq/airbyte/actions/runs/1611255875
✅ connectors/source-zendesk-chat https://github.com/airbytehq/airbyte/actions/runs/1611255875
Python tests coverage:

	 ---------- coverage: platform linux, python 3.8.10-final-0 -----------
	 Name                              Stmts   Miss  Cover
	 -----------------------------------------------------
	 ---------- coverage: platform linux, python 3.8.10-final-0 -----------/actions-runner/_work/airbyte/airbyte/airbyte-integrations/connectors/source-zendesk-chat/.venv/lib/python3.8/site-packages/coverage/control.py:768: CoverageWarning: No data was collected. (no-data-collected)
	 main_dev.py                           6      6     0%
	   self._warn("No data was collected.", slug="no-data-collected")
	 source_zendesk_chat/__init__.py       2      2     0%
	 source_zendesk_chat/source.py        18     18     0%
	 source_zendesk_chat/streams.py      145    145     0%
	 -----------------------------------------------------
	 TOTAL                               171    171     0%
	 ---------- coverage: platform linux, python 3.8.10-final-0 -----------
	 Name                                                 Stmts   Miss  Cover
	 ------------------------------------------------------------------------
	 source_acceptance_test/__init__.py                       2      0   100%
	 source_acceptance_test/base.py                          10      4    60%
	 source_acceptance_test/config.py                        74      6    92%
	 source_acceptance_test/conftest.py                     109    109     0%
	 source_acceptance_test/plugin.py                        47     47     0%
	 source_acceptance_test/tests/__init__.py                 4      0   100%
	 source_acceptance_test/tests/test_core.py              242     96    60%
	 source_acceptance_test/tests/test_full_refresh.py       38      0   100%
	 source_acceptance_test/tests/test_incremental.py        69     38    45%
	 source_acceptance_test/utils/__init__.py                 6      0   100%
	 source_acceptance_test/utils/asserts.py                 37      2    95%
	 source_acceptance_test/utils/common.py                  54     17    69%
	 source_acceptance_test/utils/compare.py                 62     23    63%
	 source_acceptance_test/utils/connector_runner.py       110     48    56%
	 source_acceptance_test/utils/json_schema_helper.py     115     14    88%
	 ------------------------------------------------------------------------
	 TOTAL                                                  979    404    59%

Python short test summary info:

=========================== short test summary info ============================
SKIPPED [1] ../usr/local/lib/python3.7/site-packages/source_acceptance_test/tests/test_incremental.py:21: `future_state_path` not specified, skipping
======================== 15 passed, 1 skipped in 23.29s ========================

[annalvova05]

LGTM

[grubberr]

Just closed and passed my changes to this PR #7313 to reduce number of docker image releases