Make an empty DiffSync instance evaluate to True. #867

Job	Run time
validate_renovate	28s
black	24s
bandit	24s
pydocstyle	22s
flake8	28s
mypy	25s
yamllint	22s
build	57s
pylint	1m 14s
unittest (3.7, 1.5.1)	53s
unittest (3.8, 1.5.1)	57s
unittest (3.9, 1.5.1)	1m 0s
unittest (3.10, 1.5.1)	1m 18s
Push Package to PyPI	0s
Publish to GitHub	0s
Send notification to the Slack	0s
	9m 12s

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