Sankey - How to Present Records with Starting Point and No End Point

[qqqqqzhang]

I have a dataset like the example below. There are cases where there is no 'to' node, meaning the records stay in a node without moving forward. If I plot it using Sankey, it creates an end node that represents the blank and draws a path from A(Row 1) to the blank Node.  What' I'd really like to show is to remove the path from A to Blank(Row1) and showing a dead end on A . Is ther a way to do it? Any thoughts would be helpful. 

From	To	Total
A		100
A	B	200
B	C	300
B	D	240