Crash when type is HTTP and module not set

[rogerogers]

Describe the bug

Crash when type is HTTP and module not set

A clear and concise description of what the bug is.

To Reproduce

syntax = "proto3";

package biz.hello;

// The greeting service definition.
option go_package = "biz/hello";

message Request {
  string message = 1;
}

message Response {
  string message = 1;
}

service Echo {
  rpc Echo (Request) returns (Response) {}
}

➜ cwgo server -service=Host -type HTTP -I idl -idl idl/hello/hello.proto
plugin protoc_gen_hertz returns error: exit status 1, cause:
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x10 pc=0x100adb498]

goroutine 1 [running]:
github.com/cloudwego/hertz/cmd/hz/protobuf.(*Plugin).Run.func1()
	/Users/rogers/go/pkg/mod/github.com/cloudwego/hertz/cmd/hz@v0.5.3-0.20230208061226-42701b832677/protobuf/plugin.go:86 +0x28
github.com/cloudwego/hertz/cmd/hz/protobuf.(*Plugin).Run(0x14000121eb8)
	/Users/rogers/go/pkg/mod/github.com/cloudwego/hertz/cmd/hz@v0.5.3-0.20230208061226-42701b832677/protobuf/plugin.go:115 +0x518
github.com/cloudwego/hertz/cmd/hz/app.PluginMode()
	/Users/rogers/go/pkg/mod/github.com/cloudwego/hertz/cmd/hz@v0.5.3-0.20230208061226-42701b832677/app/app.go:130 +0x9c
main.main()
	/Users/rogers/go/pkg/mod/github.com/cloudwego/cwgo@v0.0.0-20230224083820-c081b37bf35f/cwgo.go:32 +0x20
--hertz_out: protoc-gen-hertz: Plugin failed with status code 2.

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4. See error

Expected behavior

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Kitex version:

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Environment:

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