How to check if a cell has a comment?

Question

Google Sheets

Is it possible to make conditional formatting work after adding a comment to a Google Spreadsheet cell, for example O2?
How can I check if there is a comment in a cell (this is such crap, very similar to a note).

Answer 1

I think it can be done using the =ECLI() function
Example:
=if(B14="";"Empty";"there is a comment")