As you know CKEditor has become an editor of choice in Management Server 11.2.1 and above
It is a very robust and highly customizable editor
In modifying certain functionality of this Editor in Management Server it is recommended to create a parallel editor to the original one and use it as alternative for one user or a group of users
Here is the KBA that suggests how to create an alternative CKEditor which would prevent the editor from inserting in between empty p tags (<p></p>)