Fix parsing error when entry from dict returns None

[PSzczepanski1996]

Description

Describe:

• Content of the pull request

Fixes error when the entries is None.

• Feature added / Problem fixed

TypeError: 'NoneType' object is not iterable

Checklist

• [X] I have read the contribution guide
• [X] Code lint checked via inv lint
• [ ] changes file included (see docs)
• [ ] Usage documentation added in case of new features
• [ ] Tests added

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (accdf1c) 96.57% compared to head (b322e27) 96.57%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #168 +/- ## ======================================= Coverage 96.57% 96.57% ======================================= Files 8 8 Lines 933 935 +2 Branches 69 69 ======================================= + Hits 901 903 +2 Misses 19 19 Partials 13 13 ``` | [Flag](https://app.codecov.io/gh/nephila/python-taiga/pull/168/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/nephila/python-taiga/pull/168/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila) | `96.57% <100.00%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nephila#carryforward-flags-in-the-pull-request-comment) to find out more.

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