Attributes not recognized on a callout ending in a code block

[Jnosh]

Attributes not recognized on a callout ending in a code block:

>This doesn't work:
>
>```
>Lorem ipsum dolor sit amet.
>```
{ .class }

Instead an empty paragraph with the given attributes is inserted at the end of the callout.

If there is any content after the code block, the attributes are correctly attached to the callout.

>But this does:
>
>```
>Lorem ipsum dolor sit amet.
>```
>... because of the content after the code block...
{ .class }

[sigrunixia]

Related to #19

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