Non nil body but empty in response cause 'unexpected end of JSON input' error

[renathoaz]

resty v2.7.0
go 1.20

@jeevatkm I was implementing one client and the server is probably with issue in one of the routes that sends 201 and body is empty but r.body is getting initialized somehow although its length is 0. Maybe empty string is coming from server.
It also affects SetResult(), maybe a check in parseResponseBody is also needed to prevent error from unmarshalling empty []byte{}

if we change from:

func (r *Response) fmtBodyString(sl int64) string {
	if r.body != nil  {
		if int64(len(r.body)) > sl {
...

Actual: Here we can see there's nothing in body, maybe empty string? but Content-Type is application/json; charset=utf-8

to:

func (r *Response) fmtBodyString(sl int64) string {
	if r.body != nil && len(r.body) > 0 {
		if int64(len(r.body)) > sl {
...

After this small change everything is fine now:

[jeevatkm]

@renathoaz Thanks for bringing it up. I noticed your suggestion in PRs #654 and #674; once merged, it will resolve.