Filter out empty entities internally (#1041)

* Filter out empty entities internally 

I guess it's fine to handle empty entities internally to avoid ENTITY_BOUNDS_INVALID , so the client won't send the empty entities

* revert utils and apply changes to parser/html.py

* Update utils.py

* Update utils.py

* Update utils.py

* Update html.py

* Update utils.py

* Update utils.py

Co-authored-by: Dan <14043624+delivrance@users.noreply.github.com>