blank.lines.skip=TRUE malfunctions when sep is ' '

[st-pasha]

First case throws an exception even though it shouldn't; second case ignores the option blank.lines.skip=TRUE.

> fread("a b 2\nc d 3\n\ne f 4\n", blank.lines.skip=T)
Error in fread("a b 2\nc d 3\n\ne f 4\n", blank.lines.skip = T) : 
  Expecting 3 cols but row 0 contains only 0 cols (sep=' '). Consider fill=true. <<>>

> fread("a b 2\nc d 3\n\ne f 4\n", blank.lines.skip=T, fill=T)
   V1 V2 V3
1:  a  b  2
2:  c  d  3
3:       NA
4:  e  f  4