Error in exporting the speaker verification model to ONNX
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The following code
```python3
import torch
import nemo.collections.asr as nemo_asr


speaker_model = nemo_asr.models.EncDecSpeakerLabelModel.from_pretrained(model_name="ecapa_tdnn")
with torch.no_grad():
  speaker_model.eval()
  speaker_model.export('model.onnx')
```
fails to export the model using the latest master and it throws the following error logs:
```
[NeMo I 2024-01-13 11:35:35 features:289] PADDING: 16
[NeMo I 2024-01-13 11:35:36 save_restore_connector:249] Model EncDecSpeakerLabelModel was successfully restored from /root/.cache/torch/NeMo/NeMo_1.21.0rc0/ecapa_tdnn/3e0c5c4731b176aeb70c29a74d800c81/ecapa_tdnn.nemo.
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
[<ipython-input-2-3f0cb43be965>](https://localhost:8080/#) in <cell line: 6>()
      6 with torch.no_grad():
      7   speaker_model.eval()
----> 8   speaker_model.export('model.onnx')

2 frames
[/usr/local/lib/python3.10/dist-packages/nemo/utils/export_utils.py](https://localhost:8080/#) in parse_input_example(input_example)
    116 
    117 def parse_input_example(input_example):
--> 118     input_list = list(input_example)
    119     input_dict = {}
    120     # process possible kwargs

TypeError: 'NoneType' object is not iterable
```

---

Please use the following colab notebook to reproduce it

https://colab.research.google.com/drive/1hQumtSeKdDMCupcUHgrEIcX67c3AW1bj?usp=sharing