Handle empty fields in usersync _parse_csv()

[paulineribeyre]

Traceback (most recent call last):
[...]
File "/fence/fence/sync/sync_users.py", line 1288, in _get_user_permissions_from_csv_list
 user_projects, user_info = self._parse_csv(
  File "/fence/fence/sync/sync_users.py", line 559, in _parse_csv
   phsid = row.get("phsid", "").split(".")
AttributeError: 'NoneType' object has no attribute 'split'

This appear to happens with a malformed CSV row missing some commas, for example:

user name,login,phsid,permission set,created,updated
user1,user1

Improvements

• More robust CSV parsing in usersync

[coveralls]

Pull Request Test Coverage Report for Build 13559

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.003%) to 74.474%

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Totals
Change from base Build 13548:	-0.003%
Covered Lines:	7186
Relevant Lines:	9649

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💛 - Coveralls

[BinamB]

Lgtm