Fix for subcommands with @Command UDA without a name

[andrey-zherikov]

Closes #111

[codecov[bot]]

Codecov Report

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

Comparison is base (0654af0) 98.77% compared to head (2e69e4c) 98.98%. Report is 5 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #150 +/- ## ========================================== + Coverage 98.77% 98.98% +0.21% ========================================== Files 27 27 Lines 1789 2354 +565 ========================================== + Hits 1767 2330 +563 - Misses 22 24 +2 ```

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