Ignore empty input lines and add expand OBIS map

[codecov[bot]]

Codecov Report

Patch coverage: 75.00% and no project coverage change

Comparison is base (52ecdcd) 65.00% compared to head (eec7692) 65.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #35 +/- ## ======================================= Coverage 65.00% 65.00% ======================================= Files 21 21 Lines 820 823 +3 ======================================= + Hits 533 535 +2 - Misses 287 288 +1 ``` | [Impacted Files](https://codecov.io/gh/jedie/pysmartmeter/pull/35?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jens+Diemer) | Coverage Δ | | |---|---|---| | [pysmartmeter/obis\_map.py](https://codecov.io/gh/jedie/pysmartmeter/pull/35?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jens+Diemer#diff-cHlzbWFydG1ldGVyL29iaXNfbWFwLnB5) | `100.00% <ø> (ø)` | | | [pysmartmeter/parser.py](https://codecov.io/gh/jedie/pysmartmeter/pull/35?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jens+Diemer#diff-cHlzbWFydG1ldGVyL3BhcnNlci5weQ==) | `94.05% <75.00%> (-0.84%)` | :arrow_down: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jens+Diemer). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jens+Diemer)

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