marshalValue silently fails for unsupported values

[dolmen]

marshalValue doesn't handle the wide range of values supported by encoding/json (such as any value implementing json.Marshaler) but silently fails (no output) instead of reporting an error indicating an unsupported data type.

Example: https://play.golang.org/p/dmF0aGDl0J5

package main

import (
	"encoding/json"
	"fmt"
	"log"

	"github.com/TylerBrock/colorjson"
)

func main() {
	raw := json.RawMessage(`{
  "str": "foo",
  "num": 100,
  "bool": false,
  "null": null,
  "array": ["foo", "bar", "baz"],
  "obj": { "a": 1, "b": 2 }
}`)

	f := colorjson.NewFormatter()
	f.Indent = 2

	b, err := f.Marshal(raw)
	if err != nil {
		log.Fatal(err)
	}
	if len(b) == 0 {
		log.Fatal("no output")
	}
	fmt.Println(string(b))
}

[diogogmt]

Came across the same issue.
When calling colorjson.Marshal no error and no output is returned back.

[pablodz]

bump

[DaveGardner-Alfi]

same

[Freccia]

same