For some reason, the new submodule test still broke on py3

Adjusted code to not check for .gitmodules existence anymore, we will
deal with it.

Fixes gitpython-developers#117

Author: Byron

git/objects/submodule/base.py

@@ -159,9 +159,6 @@ def _config_parser(cls, repo, parent_commit, read_only):
         if not repo.bare and parent_matches_head:
             fp_module = cls.k_modules_file
             fp_module_path = os.path.join(repo.working_tree_dir, fp_module)
-            if read_only and not os.path.isfile(fp_module_path):
-                raise IOError("%s file was not accessible" % fp_module_path)
-            # END handle existance
             fp_module = fp_module_path
         else:
             try: