Support for tables with empty headers #589

Description

Currently empty headers don't hide headers in tables. This seems wasteful spacewise and would be awesome if header was hidden in this case.

With following markdown:

|  |  |
| --- | --- |
| **Inherits** | [`Object`](../Object.md) |
| **Defined in** | `actionpack/lib/abstract_controller/base.rb` |

This is getting rendered:

Version

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Environment

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