Allowing empty signal encoders

[c4deszes]

Brief

• Grammar has been updated to allow empty encoders

Checklist

• [x] Add relevant labels to the Pull Request
• [ ] Review test results and code coverage
  • [ ] Review snapshot test results for deviations
• [x] Review code changes
  • [ ] Create relevant test scenarios
  • [ ] Update examples
  • [ ] Update JSON schema
• [ ] Update documentation
  • [ ] Update examples in README
• [x] Update changelog
• [x] Update version number

Resolves

• Fixes #138

Evidence

• Tested manually

[codecov[bot]]

Codecov Report

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

Project coverage is 96.31%. Comparing base (fbf34fe) to head (a257c1f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #139 +/- ## ======================================= Coverage 96.31% 96.31% ======================================= Files 13 13 Lines 1467 1467 ======================================= Hits 1413 1413 Misses 54 54 ``` | [Flag](https://app.codecov.io/gh/c4deszes/ldfparser/pull/139/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bal%C3%A1zs+Eszes) | Coverage Δ | | |---|---|---| | [3.10](https://app.codecov.io/gh/c4deszes/ldfparser/pull/139/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bal%C3%A1zs+Eszes) | `96.31% <ø> (ø)` | | | [3.11](https://app.codecov.io/gh/c4deszes/ldfparser/pull/139/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bal%C3%A1zs+Eszes) | `96.31% <ø> (ø)` | | | [3.12](https://app.codecov.io/gh/c4deszes/ldfparser/pull/139/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bal%C3%A1zs+Eszes) | `96.31% <ø> (ø)` | | | [3.6](https://app.codecov.io/gh/c4deszes/ldfparser/pull/139/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bal%C3%A1zs+Eszes) | `96.31% <ø> (ø)` | | | [3.7](https://app.codecov.io/gh/c4deszes/ldfparser/pull/139/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bal%C3%A1zs+Eszes) | `96.31% <ø> (ø)` | | | [3.8](https://app.codecov.io/gh/c4deszes/ldfparser/pull/139/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bal%C3%A1zs+Eszes) | `96.31% <ø> (ø)` | | | [3.9](https://app.codecov.io/gh/c4deszes/ldfparser/pull/139/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Bal%C3%A1zs+Eszes) | `96.31% <ø> (ø)` | | 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=Bal%C3%A1zs+Eszes#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.