Fix footnotes starting with empty line

org/testdata/example.org

@@ -89,7 +89,7 @@ either ~this~
 or ~that~ foo.
 *** DONE [[https://github.com/chaseadamsio/goorgeous/issues/68][#68]]: Quote block with inline markup
 #+BEGIN_QUOTE
-[[www.example.com][/this/ *is* _markup_!]]
+[[https://www.example.com][/this/ *is* _markup_!]]
 #+END_QUOTE
 
 *** DONE [[https://github.com/chaseadamsio/goorgeous/issues/77][#77]]: Recognize =code=--- as code plus dash
@@ -111,7 +111,7 @@ Foo paragraph.
 **** Bar
 Bar paragraph
 ** Footnotes
-- normal footnote reference [fn:1]
+- normal footnote reference [fn:1] [fn:6]
 - further references to the same footnote should not [fn:1] render duplicates in the footnote list
 - inline footnotes are also supported via [fn:2:the inline footnote definition].
 
@@ -134,4 +134,7 @@ Bar paragraph
 
 [fn:5] another unused footnote
 
-[fn:6] another unused footnote
+[fn:6]
+
+Footnotes break after two consecutive empty lines - just like paragraphs - see https://orgmode.org/worg/dev/org-syntax.html.
+This shouldn't happen when the definition line and the line after that are empty.