Poll must not be visible in website unless it be marked to appear published

[tiagozini]

What and How

As a administrator
I want to a poll could not appear on website unless I have marked this poll in its edition or creation section allowing this poll to be published. Although, always this poll must be visible for administrator for preview how the poll will be formatted in the website.

Why

As a administrator is necessary that a poll not finished with its questions in the building process doesn´t appear neither in coming section or in the current section of polls.

[arthur1041]

I can work on a fix for this issue.