Automation : column completed or not

I would like to be able to detect if there is something written in a column. If there is at least one character (not a space) in the column i would like to be able, for example, to put a 1 in aother column to be able to use it for another automatisation.
Today i’m using “if column changes”, but if there is something in the column and I remove it, the system consider it as a change, so doesnt fully work for me.