Please update the addon to the latest version (v. 1.0.4) delete all kind of caches and check again. 

Problems:

1. It is added to the outputted HTML even if the mentioned page doesn't have the comments section in it. The screenshots provided here were all taken from a page on my site that doesn't have comments enabled.

2. It takes up space even when it is invisible, and since it is added to the bottom of the page HTML, it reserves a certain amount of space below the footer, pushing the footer that should be on the bottom of the page up. 

The easy way to solve it is to just set its display to none when it should be invisible.

Strangely enough, there is no such issue (the issue of it taking space below the footer) on pages on my site that actually do have the comment section, so I assume that it is handled correctly in your code and you just need to fix the problem of it being injected where it shouldn't be.