How to get Insets if no Renderer exists

Question

If the JTable's cells have an associated Renderer I am able to get the insets.

:
int x = ((JComponent)myRenderer).getInsets().left)
:
:
int x = ((JComponent)myRenderer).getInsets().right)
:

I have specific code to verify if the call from getCellRenderer() returns a null and it does. When this occurs I am uncertain how the Insets can be retrieved?