(ba) returns TRUE is the structure is null, empty or vide. For this
last case, their list is given by
rbsb.null which is increased
with new objects by the children packages.
Any object being null for
isempty is for
isvide("") is FALSE.
object to be scrutinazed
Have a look to the code itself.
TRUE when the object is considered as not filled, FALSE if not.
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