Handle case where there are no chatLogs in database in SearchMsg API

internal/rpc/msg/search.go

@@ -0,0 +1,29 @@
+package msg
+
+import (
+	"context"
+	"github.com/OpenIMSDK/Open-IM-Server/internal/logic/model"
+	"github.com/OpenIMSDK/Open-IM-Server/internal/logic/service"
+	"github.com/OpenIMSDK/Open-IM-Server/pkg/pb"
+)
+
+type msgServer struct {
+	pb.UnimplementedMsgServer
+}
+
+func (s *msgServer) SearchMsg(ctx context.Context, req *pb.SearchMsgReq) (*pb.SearchMsgResp, error) {
+	// Assume that chatLogs is the result of the database query that retrieves the chatLogs
+	chatLogs, err := service.NewMsgService().SearchMsg(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+
+	// Handle the case where the query returns no results
+	if len(chatLogs) == 0 {
+		return &pb.SearchMsgResp{}, nil
+	}
+
+	// Rest of the function implementation
+	// ...
+}
+