I've just gone to File, New, Blank Page, HTML and Dreamweaver created a new page with the requisite tags for an empty page.
In Code view I then selected all the lines by dragging the mouse down the left of them, pressed the Delete key and they were deleted leaving just the number 1 at the top of the line numbers column.
Deamweaver is a web site development tool and is designed to add code to help you. If you want a new page without any code perhaps you should use Notepad? Or am I not understanding what you mean?