evm: fix get storage (#375)

x/evm/keeper/grpc_query.go

@@ -154,13 +154,6 @@ func (k Keeper) Storage(c context.Context, req *types.QueryStorageRequest) (*typ
 		)
 	}
 
-	if ethermint.IsEmptyHash(req.Key) {
-		return nil, status.Errorf(
-			codes.InvalidArgument,
-			types.ErrEmptyHash.Error(),
-		)
-	}
-
 	ctx := sdk.UnwrapSDKContext(c)
 	k.WithContext(ctx)
 
@@ -170,12 +163,6 @@ func (k Keeper) Storage(c context.Context, req *types.QueryStorageRequest) (*typ
 	state := k.GetState(address, key)
 	stateHex := state.Hex()
 
-	if ethermint.IsEmptyHash(stateHex) {
-		return nil, status.Error(
-			codes.NotFound, "contract code not found for given address",
-		)
-	}
-
 	return &types.QueryStorageResponse{
 		Value: stateHex,
 	}, nil

x/evm/keeper/grpc_query_test.go

@@ -271,15 +271,6 @@ func (suite *KeeperTestSuite) TestQueryStorage() {
 			},
 			false,
 		},
-		{"empty hash",
-			func() {
-				req = &types.QueryStorageRequest{
-					Address: suite.address.String(),
-					Key:     ethcmn.Hash{}.String(),
-				}
-			},
-			false,
-		},
 		{
 			"success",
 			func() {