>Psychtoolbox>PsychOneliners

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
DN 2012-06-12 fixed bug where only first element in struct array was
operated on