open difference in exceptions raised (another trailing separator problem)

[agroce]

import shutil
import pyfakefs.fake_filesystem
import os

ROOT_PATH = "/Volumes/ramdisk/newtest"

fs = pyfakefs.fake_filesystem.FakeFilesystem()
fs.CreateDirectory('/Volumes')
fs.CreateDirectory('/Volumes/ramdisk')
fs.CreateDirectory('/Volumes/ramdisk/newtest')
os0 = pyfakefs.fake_filesystem.FakeOsModule(fs)
opener0 = pyfakefs.fake_filesystem.FakeFileOpen(fs)

if False:
    os0 = os
    opener0 = open
    shutil.rmtree(ROOT_PATH)
    os.mkdir(ROOT_PATH)

component0 = "alpha" 
component1 = "" 
path0 = ROOT_PATH 
path0 += os.path.sep + component0 
path0 += os.path.sep + component1 
file0 = opener0(path0,'w') 

OSError for pyfakefs, IOError for Python

[mrbean-bremen]

This is an exact duplicate of #362. As we have regression tests for this one, I guess it is a mistake - closing.