fix zero coins (backport #9229)

[mergify]

This is an automatic backport of pull request #9229 done by Mergify.
Cherry-pick of f04b5dc has failed:

On branch mergify/bp/release/v0.42.x/pr-9229
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Unmerged paths:
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	both modified:   CHANGELOG.md
	both modified:   x/bank/keeper/genesis_test.go
	both modified:   x/bank/keeper/keeper.go
	both modified:   x/bank/keeper/keeper_test.go
	both modified:   x/bank/keeper/send.go

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[lgtm-com]

This pull request introduces 2 alerts when merging 9e18396 into 75f84b5 - view on LGTM.com

new alerts:

• 1 for Useless assignment to local variable
• 1 for Unreachable statement

[aaronc]

I don't see how we can backport this. There was a change to supply behavior from 0.42. Closing