Empty entry in TOC, when table is added between two H2's

[klartext]

With this md-code:

# H1

## H2 - first

|Foo  |Bar  |
|-----|-----|
|01   |02   |

## H2 - second

I get three entries on the H2-level, two for the H2's and one empty one for the table.

[michaelrsweet]

Hmm, will need to look at the markdown parser to see what's up here...

[michaelrsweet]

[master cbf3130] Fix markdown parsing bug (Issue #503)