Shouldn't check wallet before requests that doesn't require wallet.

[devyetii]

Most of GET requests in zcncore like this one:

gosdk/zcncore/wallet_base.go

Lines 1006 to 1017 in f0d0889

	// GetAllocation obtains allocation information.
	func GetAllocation(allocID string, cb GetInfoCallback) (err error) {
	if err = CheckConfig(); err != nil {
	return
	}
	var url = withParams(STORAGESC_GET_ALLOCATION, Params{
	"allocation": allocID,
	})
	go GetInfoFromSharders(url, OpStorageSCGetAllocation, cb)
	return
	}

checks for valid wallet, however the wallet is not needed for such a request, should only check sdk config. This affect 0box, for example, since no wallet is configured for it usually.

Related discussion: https://0chain.slack.com/archives/C04EFTQH26T/p1682726300357019