Description of problem:

When run following code I get segmentation fault when one of repomd_fn, primary_fn, filelists_fn files does not actually exist on the filesystem:

from __future__ import print_function
from __future__ import unicode_literals
from __future__ import division
from __future__ import absolute_import

import os
import re
import rpm
import time
import glob
import hawkey
import shutil
import librepo
import ConfigParser

sack = hawkey.Sack()

path = "/mnt/cache/%s"

repo1 = hawkey.Repo("Fedora")
repo1.repomd_fn = path % "fedora/repodata/repomd.xml"
repo1.primary_fn = path % "fedora/repodata/d7777ea6ec66e1c86c3fe1900adf5bf8d877fb77dd06e439bd76bbbec4e82094-primary.xml.gz"
repo1.filelists_fn = path % "fedora/repodata/ef9c432f9a354c202cadbd415248891bfd30addfd2bda52be2391156e32c5392-filelists.xml.gz"

repo2 = hawkey.Repo("Updates")
repo2.repomd_fn = path % "updates/repodata/repomd.xml"
repo2.primary_fn = path % "updates/repodata/41bf2a05469f49f390c5dddd4712814b0a3cfff22b2bd9ea8ebe4490a6769e39-primary.xml.gz"
repo2.filelists_fn = path % "updates/repodata/ed23cac14f1f9d37bf900fa87596c8fcad8c76557b85d5ee203a57fdbb239577-filelists.xml.gz"

sack.load_yum_repo(repo1, load_filelists=True)
len(sack)
sack.load_yum_repo(repo2, load_filelists=True)
len(sack)


Version-Release number of selected component (if applicable):
hawkey-0.4.11-1.fc20.x86_64
python-hawkey-0.4.11-1.fc20.x86_64
python-2.7.5-11.fc20.x86_64


How reproducible:
Everytime, when target file does not exist


Steps to Reproduce:
1. Run above code.
2. Make sure that files transferred to Repo object dont exist on filesystem.
3. Segfault happens when invoking sack.load_yum_repo() on repo that has missing files.


Actual results:
Segmentation fault


Expected results:
Working sack

Additional info: