GitLab

* Removed an expression which is always true
* The second expression (ch is space) is removed because the first one contains space 0x20
* nextEmptyLine is always false so it is removed from the expression

Added constructor to the Emitter with a stream, so you can write directly to a stream instead of our temp

Fixed when we emit the doc start (only if there already is a document in the stream, and we're about to emit a new node)