3K: core: fix import_array to return NULL on failure -- according to the Py3 module init function scheme
3K: core: fix import_array to return NULL on failure -- according to the Py3 module init function scheme

git-svn-id: 77a43f9646713b91fea7788fad5dfbf67e151ece@8283 94b884b6-d6fd-0310-90d3-974f1d3f35e1

Ademan/NumPy-GSoC,Ademan/NumPy-GSoC,teoliphant/numpy-refactor,Ademan/NumPy-GSoC,Ademan/NumPy-GSoC,teoliphant/numpy-refactor,jasonmccampbell/numpy-refactor-sprint,jasonmccampbell/numpy-refactor-sprint,jasonmccampbell/numpy-refactor-sprint,jasonmccampbell/numpy-refactor-sprint,teoliphant/numpy-refactor,teoliphant/numpy-refactor,teoliphant/numpy-refactor