Test the behaviour of an empty RE2::Set.
Test the behaviour of an empty RE2::Set.

Fixes #38.

Change-Id: I7e409676b58b69e6e48757f22569629a645e95b2
Reviewed-on: https://code-review.googlesource.com/3224
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

lnussbaum/re2,google/re2,simudream/re2,Cfretz244/re2,rAntonioh/re2,simudream/re2,evilmucedin/re2,yanqingmen/re2,lnussbaum/re2,google/re2,Cfretz244/re2,Cfretz244/re2,simudream/re2,pombredanne/re2,pombredanne/re2,pombredanne/re2,wanggchongg/re2,rAntonioh/re2,google/re2,lnussbaum/re2,bowlofstew/re2,pombredanne/re2,lnussbaum/re2,evilmucedin/re2,ElectronicRU/re2,lnussbaum/re2,yanqingmen/re2,yanqingmen/re2,ElectronicRU/re2,bowlofstew/re2,yanqingmen/re2,wanggchongg/re2,wanggchongg/re2,Cfretz244/re2,bowlofstew/re2,rAntonioh/re2,google/re2,wanggchongg/re2,yanqingmen/re2,evilmucedin/re2,pombredanne/re2,simudream/re2,rAntonioh/re2,bowlofstew/re2,simudream/re2,bowlofstew/re2,Cfretz244/re2,wanggchongg/re2,evilmucedin/re2,ElectronicRU/re2,ElectronicRU/re2,evilmucedin/re2,google/re2,ElectronicRU/re2,rAntonioh/re2