It's blank line that is used to break list by design/intention. It means:

This template is optional but it may be useful to see such cases.

တူဝ်ယၢင်ႇ

မႄးထတ်း
{{topx}}
* 111
* 111
* 111
* 111
{{bl}}
* 111
* 111
{{bl}}
* 111
{{bottom}}
  • 111
  • 111
  • 111
  • 111
  • 111
  • 111
  • 111
|}
{{acol}}
* 111
** 222
** 222
** 222
* 111
** 222
** 222
** 222
{{bl}}
* 111
* 111
* 111
  • 111
    • 222
    • 222
    • 222
  • 111
    • 222
    • 222
    • 222
  • 111
  • 111
  • 111