tweak: Response when Polly is disabled

[cmaddox5]

When Polly is disabled, Watts was returning an empty string. To better simulate prod, I added a static mp3 file for it to return instead. Audio reads This is sample audio for Watts. This is a sample audio file. Text-to-speech is disabled in this environment..

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[github-actions]

Coverage of commit 89ee889

Summary coverage rate:
  lines......: 6.1% (2 of 33 lines)
  functions..: 33.3% (2 of 6 functions)
  branches...: no data found

Files changed coverage rate:
                          |Lines       |Functions  |Branches    
  Filename                |Rate     Num|Rate    Num|Rate     Num
  ==============================================================
  lib/web_api.ex          | 3.1%     32|20.0%     5|    -      0

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[digitalcora]

Minor thing: it might be nice if the sample audio "explained itself" a bit better for the sake of non-developers who may hear it. Something like "This is a sample audio file. Text-to-speech is disabled in this environment."

[github-actions]

Coverage of commit 3cb8f4e

Summary coverage rate:
  lines......: 6.1% (2 of 33 lines)
  functions..: 33.3% (2 of 6 functions)
  branches...: no data found

Files changed coverage rate:
                          |Lines       |Functions  |Branches    
  Filename                |Rate     Num|Rate    Num|Rate     Num
  ==============================================================
  lib/web_api.ex          | 3.1%     32|20.0%     5|    -      0

Download coverage report