[price-feeder] gracefully handle nil response for new provider

[udpatil]

Describe your changes and provide context

The response from Dial can sometimes be nil if there are specific errors. However, the defer assumes that there will never be a nil response, so attempting to get the Body from response causes a nil pointer panic. The true correct assumption is that body is non-nil IFF response is non-nil, so we want to have a check for non-nil response prior to Closeing the body.

Testing performed to validate your change

[github-actions]

Package	Line Rate	Complexity	Health
github.com/sei-protocol/sei-chain/aclmapping/bank	83%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/dex	100%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/oracle	100%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/staking	96%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/tokenfactory	96%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/utils	0%	0	❌
github.com/sei-protocol/sei-chain/aclmapping/wasm	83%	0	✔
github.com/sei-protocol/sei-chain/app	61%	0	➖
github.com/sei-protocol/sei-chain/app/antedecorators	76%	0	✔
github.com/sei-protocol/sei-chain/oracle/price-feeder/config	85%	0	✔
github.com/sei-protocol/sei-chain/oracle/price-feeder/oracle	67%	0	➖
github.com/sei-protocol/sei-chain/oracle/price-feeder/oracle/provider	48%	0	❌
github.com/sei-protocol/sei-chain/oracle/price-feeder/router/v1	45%	0	❌
github.com/sei-protocol/sei-chain/store/whitelist/cachemulti	100%	0	✔
github.com/sei-protocol/sei-chain/store/whitelist/kv	100%	0	✔
github.com/sei-protocol/sei-chain/store/whitelist/multi	100%	0	✔
github.com/sei-protocol/sei-chain/utils	59%	0	➖
github.com/sei-protocol/sei-chain/utils/datastructures	90%	0	✔
github.com/sei-protocol/sei-chain/utils/logging	100%	0	✔
github.com/sei-protocol/sei-chain/x/dex	58%	0	➖
github.com/sei-protocol/sei-chain/x/dex/cache	87%	0	✔
github.com/sei-protocol/sei-chain/x/dex/client/cli/query	23%	0	❌
github.com/sei-protocol/sei-chain/x/dex/contract	51%	0	➖
github.com/sei-protocol/sei-chain/x/dex/exchange	94%	0	✔
github.com/sei-protocol/sei-chain/x/dex/keeper	64%	0	➖
github.com/sei-protocol/sei-chain/x/dex/keeper/abci	29%	0	❌
github.com/sei-protocol/sei-chain/x/dex/keeper/msgserver	78%	0	✔
github.com/sei-protocol/sei-chain/x/dex/keeper/query	82%	0	✔
github.com/sei-protocol/sei-chain/x/dex/migrations	88%	0	✔
github.com/sei-protocol/sei-chain/x/dex/types	1%	0	❌
github.com/sei-protocol/sei-chain/x/dex/types/utils	100%	0	✔
github.com/sei-protocol/sei-chain/x/dex/types/wasm	86%	0	✔
github.com/sei-protocol/sei-chain/x/epoch	11%	0	❌
github.com/sei-protocol/sei-chain/x/epoch/keeper	66%	0	➖
github.com/sei-protocol/sei-chain/x/epoch/types	2%	0	❌
github.com/sei-protocol/sei-chain/x/mint	0%	0	❌
github.com/sei-protocol/sei-chain/x/mint/keeper	61%	0	➖
github.com/sei-protocol/sei-chain/x/mint/simulation	95%	0	✔
github.com/sei-protocol/sei-chain/x/mint/types	3%	0	❌
github.com/sei-protocol/sei-chain/x/nitro/client/cli	45%	0	❌
github.com/sei-protocol/sei-chain/x/nitro/keeper	80%	0	✔
github.com/sei-protocol/sei-chain/x/nitro/replay	63%	0	➖
github.com/sei-protocol/sei-chain/x/oracle	67%	0	➖
github.com/sei-protocol/sei-chain/x/oracle/keeper	83%	0	✔
github.com/sei-protocol/sei-chain/x/oracle/simulation	18%	0	❌
github.com/sei-protocol/sei-chain/x/oracle/types	3%	0	❌
github.com/sei-protocol/sei-chain/x/tokenfactory/keeper	85%	0	✔
github.com/sei-protocol/sei-chain/x/tokenfactory/types	2%	0	❌
Summary	15% (5165 / 34228)	0	❌