fix(protoc-gen-go-errors): fix generated function comments have extra blank lines. (#2008)

cmd/protoc-gen-go-errors/template.go

@@ -8,18 +8,18 @@ import (
 var errorsTemplate = `
 {{ range .Errors }}
 
-{{if .HasComment}}{{.Comment}}{{end}}
+{{ if .HasComment }}{{ .Comment }}{{ end -}}
 func Is{{.CamelValue}}(err error) bool {
 	if err == nil {
 		return false
 	}
 	e := errors.FromError(err)
-	return e.Reason == {{.Name}}_{{.Value}}.String() && e.Code == {{.HTTPCode}} 
+	return e.Reason == {{ .Name }}_{{ .Value }}.String() && e.Code == {{ .HTTPCode }} 
 }
 
-{{if .HasComment}}{{.Comment}}{{end}}
-func Error{{.CamelValue}}(format string, args ...interface{}) *errors.Error {
-	 return errors.New({{.HTTPCode}}, {{.Name}}_{{.Value}}.String(), fmt.Sprintf(format, args...))
+{{ if .HasComment }}{{ .Comment }}{{ end -}}
+func Error{{ .CamelValue }}(format string, args ...interface{}) *errors.Error {
+	 return errors.New({{ .HTTPCode }}, {{ .Name }}_{{ .Value }}.String(), fmt.Sprintf(format, args...))
 }
 
 {{- end }}