feat: don`t return nil data (openimsdk#2675)

Co-authored-by: Monet Lee <[email protected]>

go.mod

@@ -13,7 +13,7 @@ require (
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
 	github.com/mitchellh/mapstructure v1.5.0
 	github.com/openimsdk/protocol v0.0.72-alpha.32
-	github.com/openimsdk/tools v0.0.50-alpha.12
+	github.com/openimsdk/tools v0.0.50-alpha.15
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/prometheus/client_golang v1.18.0
 	github.com/stretchr/testify v1.9.0

go.sum

@@ -321,8 +321,8 @@ github.com/openimsdk/gomake v0.0.14-alpha.5 h1:VY9c5x515lTfmdhhPjMvR3BBRrRquAUCF
 github.com/openimsdk/gomake v0.0.14-alpha.5/go.mod h1:PndCozNc2IsQIciyn9mvEblYWZwJmAI+06z94EY+csI=
 github.com/openimsdk/protocol v0.0.72-alpha.32 h1:GnGNVPc9Q/J1kA9KlxIcfciNtxXhxJXpwjFmGUYMJXY=
 github.com/openimsdk/protocol v0.0.72-alpha.32/go.mod h1:OZQA9FR55lseYoN2Ql1XAHYKHJGu7OMNkUbuekrKCM8=
-github.com/openimsdk/tools v0.0.50-alpha.12 h1:rV3BxgqN+F79vZvdoQ+97Eob8ScsRVEM8D+Wrcl23uo=
-github.com/openimsdk/tools v0.0.50-alpha.12/go.mod h1:h1cYmfyaVtgFbKmb1Cfsl8XwUOMTt8ubVUQrdGtsUh4=
+github.com/openimsdk/tools v0.0.50-alpha.15 h1:HV9aKZ4vvCZCGG4wFDsgUONkkdJeCcrFNn3BT52nUVQ=
+github.com/openimsdk/tools v0.0.50-alpha.15/go.mod h1:h1cYmfyaVtgFbKmb1Cfsl8XwUOMTt8ubVUQrdGtsUh4=
 github.com/pelletier/go-toml/v2 v2.2.2 h1:aYUidT7k73Pcl9nb2gScu7NSrKCSHIDE89b3+6Wq+LM=
 github.com/pelletier/go-toml/v2 v2.2.2/go.mod h1:1t835xjRzz80PqgE6HHgN2JOsmgYu/h4qDAS4n929Rs=
 github.com/pierrec/lz4/v4 v4.1.21 h1:yOVMLb6qSIDP67pl/5F7RepeKYu/VmTyEXvuMI5d9mQ=