[[FootNote]] macro should display Nothing when no footnotes are used

[Ryan J Ollos]

I have inserted the following into my PageTemplates:

{{{
#!comment
Do not edit below this line. The FootNote macro will insert a resulting list of FootNotes if you use the FootNote macro within this document, and if you do not use it, then nothing will be added to the document.
}}}
[[FootNote]]

A very minor issue is that a small horizontal line is inserted at the bottom of the page, even if no footnotes are generated.

[Ryan J Ollos]

Fixes in [8450]. We may want to revisit the change that was made in [8450] at some point to improve coding style. I'm very new to Python.