Correctly handle err on Send

[github-actions[bot]]

Pull Request Test Coverage Report for Build 6114213680

• 0 of 6 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 82.061%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
ygnmi/gnmi.go	0	6	0.0%
<!--	Total:	0	6	0.0%	-->

Totals
Change from base Build 6038479399:	-0.2%
Covered Lines:	1935
Relevant Lines:	2358

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💛 - Coveralls