fix: better message in case association is not allowed

[robertsLando]

Ref zwave-js/node-zwave-js#6772

[github-actions]

Pull Request Test Coverage Report for Build 8068158805

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• -1 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 22.007%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
api/lib/ZwaveClient.ts	0	1	0.0%

Totals
Change from base Build 8007839126:	0.0%
Covered Lines:	3763
Relevant Lines:	18182

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💛 - Coveralls