anyxml.Xml does not handle nil attribute values correctly

[dechamps]

Steps to reproduce:

package main
  
import (
        "fmt"
        "github.com/clbanning/anyxml"
)

func main() {
        xmlout, err := anyxml.Xml(map[string]interface{}{"toplevel": nil}, "root")
        if err != nil {
                return
        }
        fmt.Println(string(xmlout))
}

Expected result:

<root><toplevel /></root>

Actual result:

<root><toplevel</root>

Which is not valid XML.

This is causing downstream issue chrismalek/jsontoxml-cli#1.

[clbanning]

Don't know what you weren't using clbanning/j2x or clbanning/mxj/j2x instead of chrismalek/jsontoxml

[dechamps]

Well that would be a question for @chrismalek, jsontoxml-cli's author.

That said, I found it was very easy to migrate jsontoxml-cli to mxj, so I sent chrismalek/jsontoxml-cli#2 to do just that.

Thanks for the help. It would probably be a good idea to update your repo to reflect the fact that it should not be used, and direct users to clbanning/mxj.