[R] omitting integer(0) rows from data frame

[Carl Witthoft]

Both PBurns and DWin are correct.  I just thought I'd add a clunky "safety
check" approach I use now and then:

Before doing the actual subset, i.e.   df[-which(something),]  ,  do
something like 

if (length(which(something)) <1 ) {skip the subsetting} else
df[-which(something)]





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