614 should throw argumentexception if hosturl isnullorwhitespace#616

clairernovotny merged 3 commits intoreactiveui:masterreactiveui/refit:masterfrom

tstivers1990:614-should-throw-argumentexception-if-hosturl-isnullorwhitespacetstivers1990/refit:614-should-throw-argumentexception-if-hosturl-isnullorwhitespaceCopy head branch name to clipboard