Suggestions with 0 votes should not be considered winners

[dkent600]

I'm seeing suggestions being marked as winners even though they have zero votes (when there is an insufficient # of submissions having votes). Suggestions with 0 votes should not be considered winners.

[jellegerbrandy]

I've added this test to confirm that it works: https://github.com/daostack/client/pull/375/files#diff-c4af85d71d3af3e7fafb628727795f47R531