优化，空数组时json输出为“[]”

@@ -2,6 +2,9 @@ package service
 
 
 import (
 import (
 	"fmt"
 	"fmt"
+	"strconv"
+	"time"
+
 	"github.com/linmadan/egglib-go/core/application"
 	"github.com/linmadan/egglib-go/core/application"
 	"github.com/linmadan/egglib-go/utils/tool_funs"
 	"github.com/linmadan/egglib-go/utils/tool_funs"
 	"gitlab.fjmaimaimai.com/allied-creation/allied-creation-cooperation/pkg/application/cooperationContract/command"
 	"gitlab.fjmaimaimai.com/allied-creation/allied-creation-cooperation/pkg/application/cooperationContract/command"
@@ -13,8 +16,6 @@ import (
 	"gitlab.fjmaimaimai.com/allied-creation/allied-creation-cooperation/pkg/infrastructure/dao"
 	"gitlab.fjmaimaimai.com/allied-creation/allied-creation-cooperation/pkg/infrastructure/dao"
 	"gitlab.fjmaimaimai.com/allied-creation/allied-creation-cooperation/pkg/infrastructure/utils"
 	"gitlab.fjmaimaimai.com/allied-creation/allied-creation-cooperation/pkg/infrastructure/utils"
 	"gitlab.fjmaimaimai.com/allied-creation/allied-creation-cooperation/pkg/log"
 	"gitlab.fjmaimaimai.com/allied-creation/allied-creation-cooperation/pkg/log"
-	"strconv"
-	"time"
 )
 )
 
 
 // CooperationContractService 共创合约服务
 // CooperationContractService 共创合约服务
@@ -828,7 +829,7 @@ func (cooperationContractService *CooperationContractService) SearchCooperationC
 	if count, cooperationContractByUndertakers, err := cooperationContractDao.SearchCooperationContractByUndertaker(tool_funs.SimpleStructToMap(searchCooperationContractByUndertakerQuery)); err != nil {
 	if count, cooperationContractByUndertakers, err := cooperationContractDao.SearchCooperationContractByUndertaker(tool_funs.SimpleStructToMap(searchCooperationContractByUndertakerQuery)); err != nil {
 		return nil, application.ThrowError(application.INTERNAL_SERVER_ERROR, err.Error())
 		return nil, application.ThrowError(application.INTERNAL_SERVER_ERROR, err.Error())
 	} else {
 	} else {
-		var cooperationContractByUndertakerDtos []*dto.CooperationContractByUndertakerDto
+		cooperationContractByUndertakerDtos := []*dto.CooperationContractByUndertakerDto{}
 		for _, cooperationContractByUndertaker := range cooperationContractByUndertakers {
 		for _, cooperationContractByUndertaker := range cooperationContractByUndertakers {
 			cooperationContractByUndertakerDto := &dto.CooperationContractByUndertakerDto{}
 			cooperationContractByUndertakerDto := &dto.CooperationContractByUndertakerDto{}
 			if err := cooperationContractByUndertakerDto.LoadDto(cooperationContractByUndertaker); err != nil {
 			if err := cooperationContractByUndertakerDto.LoadDto(cooperationContractByUndertaker); err != nil {