Changes to setup to handle harvest apps with welcome pages

This PR tried addressing the issue
https://github.com/cbmi/cilantro/pull/659

But the solution was app specific. The problem was determined to be omop harvest returning at status code 302 and the ajaxError code does not handle this case.

Signed-off-by: Sheik Hassan <solergiga@yahoo.com>
Ah thanks. That's a much smarter way lol