Fix do_nightly_build recent crash added.

theano/misc/do_nightly_build

@@ -36,6 +36,7 @@ if [ "$1" == "--buildbot" ]; then
     NOSETESTS=${ROOT_CWD}/Theano/bin/theano-nose
     export PYTHONPATH=${ROOT_CWD}:$PYTHONPATH
 else
+    ROOT_CWD=.
     COMPILEDIR=`python -c "from __future__ import print_function; import theano; print(theano.config.compiledir)"|tail -1`
     NOSETESTS=`python -c "from __future__ import print_function; import theano; print(theano.__path__[0])"|tail -1`/../bin/theano-nose
 fi