Add support for a table without an extra new line before it

[dannyp32]

Fixes the following issue where a table will not be rendered if there isn't an extra line before the table.
#818

For example this will not render correctly

Here is the table:
| Key   | Value    |
| ----  | -------- |
| Color | Blue     |
| Size  | Medium   |

But this will because there's an extra new line before the table starts

Here is the table:

| Key   | Value    |
| ----  | -------- |
| Color | Blue     |
| Size  | Medium   |

Not handled in this change - whitespace between the new line and the pipe