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## Description
Closes: #8961
SDK allows InitGenesis to return with an empty validator set. In practice, the error for an empty validator set gets thrown in tendermint. To fix this,
* Add non-empty validator set check to the `mm.InitGenesis` function. This will break `simapp.Setup` because it relies on an empty validator set [#comment](https://github.com/cosmos/cosmos-sdk/pull/8909#issuecomment-804850834).
* Update `simapp.Setup` to use a single validator.
* Fix failing tests (Most of them are keeper tests).
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## Description
Closes: #9499
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### Author Checklist
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- [x] added `!` to the type prefix if API or client breaking change
- [x] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
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- [x] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [x] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [x] reviewed "Files changed" and left comments if necessary
- [x] confirmed all CI checks have passed
### Reviewers Checklist
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your handle next to the items reviewed if you only reviewed selected items.*
I have...
- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
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* return empty list instead of rpc error when no records found for staking delegations
* fix grpc query DelegatorDelegations tests
* remove response code tests for staking delegations
* fix failing tests
* change staking delegations response code to 200 in grpc test
* add staking delegations response code tests to TestQueryDelegatorDelegationsGRPC
* add address without delegations testcase
* add changes to grpc query tests of delegatorDelegations
* remove getRequest unused function from x/staking/client/rest/grpc_query_test.go
* minor fixes
* add testcases for request with no delegations
* address review comments
* add changelog
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
* update staking specs
* use gosimple code in x/staking/client/testutil/suite.go
* small fixes
* add godoc to methods in msg_server and grpc_query
* changes to godoc and small fixes
* remove unnecessary lines
* remove mentions of serviceMsg and avoid having slash after Msg
* Rename proto Req to Pagination
* Change Res to Pagination
Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
MD Aleem
likhita-809
psaradev
Robert Zaremba
Anil Kumar Kammari
antstalepresh
Amaury Martiny
atheeshp
billy rennekamp
SaReN