Exception when text contains empty lines.

[ronnystandtke]

First let me thank you for your work. Absolutely amazing!

I noticed that the TTS system fails when the input text contains empty lines. Here is the error message:

[ERROR] Exception on /api/tts [GET]
Traceback (most recent call last):
File "/app/lib/python3.7/site-packages/flask/app.py", line 2447, in wsgi_app
response = self.full_dispatch_request()
File "/app/lib/python3.7/site-packages/flask/app.py", line 1952, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/app/lib/python3.7/site-packages/flask_cors/extension.py", line 165, in wrapped_function
return cors_after_request(app.make_response(f(*args, **kwargs)))
File "/app/lib/python3.7/site-packages/flask/app.py", line 1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/app/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise
raise value
File "/app/lib/python3.7/site-packages/flask/app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "/app/lib/python3.7/site-packages/flask/app.py", line 1936, in dispatch_request
return self.view_functionsrule.endpoint
File "/app/tts_web/main.py", line 139, in api_tts
wav_bytes = text_to_wav(text)
File "/app/tts_web/main.py", line 73, in text_to_wav
line_wav_bytes = synthesizer.synthesize(line)
File "/app/tts_web/synthesize.py", line 324, in synthesize
scale_factors=self.scale_factors,
File "/app/tts_web/synthesize.py", line 53, in tts
do_trim_silence=False,
File "/app/lib/python3.7/site-packages/TTS-0.0.6+9e3b052-py3.7-linux-x86_64.egg/TTS/tts/utils/synthesis.py", line 244, in synthesis
model, inputs, CONFIG, truncated, speaker_id, style_mel, speaker_embeddings=speaker_embedding)
File "/app/lib/python3.7/site-packages/TTS-0.0.6+9e3b052-py3.7-linux-x86_64.egg/TTS/tts/utils/synthesis.py", line 62, in run_model_torch
inputs, speaker_ids=speaker_id, speaker_embeddings=speaker_embeddings)
File "/app/lib/python3.7/site-packages/torch/autograd/grad_mode.py", line 15, in decorate_context
return func(*args, **kwargs)
File "/app/lib/python3.7/site-packages/TTS-0.0.6+9e3b052-py3.7-linux-x86_64.egg/TTS/tts/models/tacotron2.py", line 145, in inference
encoder_outputs = self.encoder.inference(embedded_inputs)
File "/app/lib/python3.7/site-packages/TTS-0.0.6+9e3b052-py3.7-linux-x86_64.egg/TTS/tts/layers/tacotron2.py", line 115, in inference
o = layer(o)
File "/app/lib/python3.7/site-packages/torch/nn/modules/module.py", line 722, in _call_impl
result = self.forward(*input, **kwargs)
File "/app/lib/python3.7/site-packages/TTS-0.0.6+9e3b052-py3.7-linux-x86_64.egg/TTS/tts/layers/tacotron2.py", line 40, in forward
o = self.convolution1d(x)
File "/app/lib/python3.7/site-packages/torch/nn/modules/module.py", line 722, in _call_impl
result = self.forward(*input, **kwargs)
File "/app/lib/python3.7/site-packages/torch/nn/modules/conv.py", line 257, in forward
self.padding, self.dilation, self.groups)
RuntimeError: Calculated padded input size per channel: (4). Kernel size: (5). Kernel size can't be greater than actual input size
[INFO] 172.17.0.1 - - [07/Mar/2021 15:33:13] "GET /api/tts?text=This%20is%20a%20test.%0A%0AThis%20also. HTTP/1.1" 500 -

[synesthesiam]

I've uploaded a fix in master, but haven't re-built the Docker images yet.