This is a follow-on to a bug i reported in 2.1.2 that got mostly fixed in 2.1.3, but I found another case it didn't handle:
https://support.atlassian.com/browse/CSP-2229

create a 2x2 table.

in the first row, put text in both columns

in the second row, first column, press the "bullet" button and type any text

then press "enter" twice and your cell will have 3 lines with bullets, the last 2 of which are empty.

save the page and you will see that the resulting text will be:

•   | |

rather than: