[datatable-help] rbindlist(x) doesn't behave like rbind for all null lists

[Chris Neff]

Simple thing:

dt <- rbindlist(list(NULL, NULL)) #dt is a data.table with 0 rows and
columns

is.null(dt) # Prints false

d <- rbind(NULL, NULL)  #d is NULL

is.null(d) # Prints true


I would expect the two to be equivalent.  This bit me when I was relying on
!is.null(dt) before assigning other columns in the data.table.  rbindlist
should return NULL in this case I would think.

Is this working as intended? Or should I file a bug?
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