docstr: Test _maybe_convert_to_wave_bytes works correctly with empty numpy array.
docstr_tok: ["Test","_maybe_convert_to_wave_bytes","works","correctly","with","empty","numpy","array","."]
code: def test_maybe_convert_to_wave_numpy_arr_empty(self):
      """Test _maybe_convert_to_wave_bytes works correctly with empty numpy array."""
      sample_rate = 44100
      fake_audio_np_array = np.array([])
  
      computed_bytes = _maybe_convert_to_wav_bytes(
          fake_audio_np_array, sample_rate=sample_rate
      )
  
      self.assertEqual(
          computed_bytes,
          b"RIFF$\x00\x00\x00WAVEfmt \x10\x00\x00\x00\x01\x00\x01\x00D\xac\x00\x00"
          b"\x88X\x01\x00\x02\x00\x10\x00data\x00\x00\x00\x00",
      )
  
imports: import io
  import os
  from io import BytesIO
  import numpy
  from parameterized import parameterized
  from scipy.io import wavfile
  import streamlit
  from streamlit.elements.media import _maybe_convert_to_wav_bytes
  from streamlit.errors import StreamlitAPIException
  from streamlit.proto.Alert_pb2 import Alert
  from streamlit.runtime.media_file_storage import MediaFileStorageError
  from streamlit.runtime.memory_media_file_storage import _calculate_file_id
  from streamlit.web.server.server import MEDIA_ENDPOINT
  from tests.delta_generator_test_case import DeltaGeneratorTestCase
label_desc: Use image node_id 6 for calling the AudioTest obj's underlying member method code with example usage: obj.test_maybe_convert_to_wave_numpy_arr_empty() without return types