fix ASGI app return empty str

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b785930) 92.64% compared to head (fb1ec11) 92.59%. Report is 1 commits behind head on master.

:exclamation: Current head fb1ec11 differs from pull request most recent head 1c4c763. Consider uploading reports for the commit 1c4c763 to get more accurate results

Files	Patch %	Lines
tremolo/lib/http_protocol.py	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #48 +/- ## ========================================== - Coverage 92.64% 92.59% -0.05% ========================================== Files 19 19 Lines 1849 1851 +2 ========================================== + Hits 1713 1714 +1 - Misses 136 137 +1 ```

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nggit / tremolo

fix ASGI app return empty str #48

Codecov Report