It would be good to have the capability to replace the <EMPTY> with Blank as the current functionality does not provide this capability if with use the Settings>Appearance> Display does not do that.
Instead we need to do the Iron python script which is also limited for the String columns but for integer column we need to enter 0 but need blanks.
I think what you want is described here? https://ideas.tibco.com/ideas/TS-I-6899
If yes, the ideas can probably be merged.