[py] fix nose test failing on py27 ci

6 jobs for testing in 51 minutes and 40 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Build
passed #148286
docker
build_linux_27

00:13:41

passed #148300
docker
build_linux_36

00:12:31

passed #148288
macosx
build_macosx_27

00:25:09

passed #148289
macosx
build_macosx_36

00:21:52

failed #148287
docker
build_linux_36

03:00:04

 
  Browser Tests
passed #148290
docker
browser_linux_36

00:13:59