Ensure options.success is called even if there's no body (e.g. 204)
Ensure options.success is called even if there's no body (e.g. 204)

Fixes: #8

synack/ampersand-sync,naugtur/ampersand-sync,AmpersandJS/ampersand-sync,mhamann/ampersand-sync,dhritzkiv/ampersand-sync,sauramirez/ampersand-sync,tnguyen14/ampersand-sync-with-promise