molgenis-armadillo functions return unhelpful error messages when logging in with incomplete URL

[timcadman]

How to Reproduce

Log in using an incomplete URL, and then try to use any molgenis-armadillo function:

demo_url = "armadillo-demo.molgenis.net"
armadillo.login(demo_url)
armadillo.create_project("armadillo-illustration")

Expected behavior

armadillo.login(demo_url) returns an error if using an incomplete URL

Observed behavior

Login succeeds but the following error is returned on running armadillo.create_project():
Error in curl::curl_fetch_memory(url, handle = handle) : URL rejected: Port number was not a decimal number between 0 and 65535