Deleted project causes error

[ejratl]

The zlib project was apparently deleted on OpenHub. The cache file reports it as a deleted project. The OpenHub deleted project page doesn't parse cleanly resulting in a Traceback as follows:
Traceback (most recent call last):
File "./oss_package_analysis.py", line 444, in
main()
File "./oss_package_analysis.py", line 406, in main
project_data['comment_on_priority'])
File "./oss_package_analysis.py", line 202, in init
self.get_openhub_data(openhub_lookup_name)
File "./oss_package_analysis.py", line 243, in get_openhub_data
tree = ET.parse(filename)
File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1182, in parse
tree.parse(source, parser)
File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 656, in parse
parser.feed(data)
File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1642, in feed
self._raiseerror(v)
File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1506, in _raiseerror
raise err
xml.etree.ElementTree.ParseError: mismatched tag: line 20, column 2

It would be nice if the program were to catch this exception. For now, I am removing the OpenHub label for zlib from the projects_to_examine file along with some other clean-ups and will submit a pull request with that updated version.

zlib.txt