in =
FillEmptyFields(in,filling)
If input is a struct (-array):
Fills all empty fields in IN with FILLING
Also operates on N-D struct arrays
If input is a cell (-array):
Fills all empty elements in IN with FILLING
DN 2008
DN 2008-05-29 Shortened it
DN 2008-05-31 added cell support
Psychtoolbox/PsychOneliners/FillEmptyFields.m