Fix broken PE unittest.
Fix broken PE unittest.

This is failing due to file-system path differences. We actually only care that the path is not empty, so the test has been adjusted to check that.

BUG=
R=sebmarchand@chromium.org

Review URL: https://codereview.appspot.com/38520043

git-svn-id: db59699583a60be9a535cd09cdc9132301867226@1931 15e8cca8-e42c-11de-a347-f34a4f72eb7d

google/syzygy,sebmarchand/syzygy,ericmckean/syzygy,sebmarchand/syzygy,sebmarchand/syzygy,pombreda/syzygy,sebmarchand/syzygy,ericmckean/syzygy,pombreda/syzygy,wangming28/syzygy,Eloston/syzygy,supriyantomaftuh/syzygy,ericmckean/syzygy,supriyantomaftuh/syzygy,wangming28/syzygy,ericmckean/syzygy,pombreda/syzygy,wangming28/syzygy,pombreda/syzygy,google/syzygy,wangming28/syzygy,supriyantomaftuh/syzygy,google/syzygy,google/syzygy,sebmarchand/syzygy,pombreda/syzygy,ericmckean/syzygy,Eloston/syzygy,supriyantomaftuh/syzygy