If I create a list with a blank line between each item, select all of the items and click on numbering it also add's number to the blank rows, I would suggest to have numbering only work on rows with characters in them.
Example
A
<blank row>
B
<blank row>
C
Select Rows A through C which includes the blank rows
Click on the numbering icon and it produces
1. A
2. <blank row>
3. B
4. <blank row>
5. C
I would prefer the output to look like
1. A
<blank row>
2. B
<blank row>
3. C
Regards...J
Numbering - Ignore blank lines
You should be able to add new line without creating new list item by pressing Shift+Enter at the end of an existing numbered item.