except PythonLayer from layer factory test
except PythonLayer from layer factory test

PythonLayer (rightfully) refuses to be instantiated when a module and
class aren't given. It's still covered by tests however through pytest.

longjon/caffe,longjon/caffe,gogartom/caffe-textmaps,gogartom/caffe-textmaps,tackgeun/caffe,wangg12/caffe,gnina/gnina,gnina/gnina,wangg12/caffe,CZCV/s-dilation-caffe,CZCV/s-dilation-caffe,tackgeun/caffe,wangg12/caffe,gnina/gnina,gnina/gnina,gnina/gnina,longjon/caffe,gogartom/caffe-textmaps,CZCV/s-dilation-caffe,wangg12/caffe,gogartom/caffe-textmaps,CZCV/s-dilation-caffe,tackgeun/caffe,longjon/caffe,gnina/gnina,tackgeun/caffe