Fix AWQ export when quantization of some layers are disabled (#721)

## What does this PR do?

**Type of change:** Bug fix <!-- Use one of the following: Bug fix, new
feature, new example, new tests, documentation. -->

**Overview:** 

Fix AWQ export when quantization of some layers are disabled

## Usage
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```python
# Add a code snippet demonstrating how to use this
```

## Testing
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## Additional Information
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Signed-off-by: weimingc <17592131+meenchen@users.noreply.github.com>

Author: meenchen

modelopt/torch/export/unified_export_hf.py

@@ -117,7 +117,9 @@ def _output_hook(module, input, output):
         module_names.add(name)
 
         # For MoE models update pre_quant_scale to average pre_quant_scale amongst experts
-        if is_moe(module) and ("awq" in quantization_format):
+        if is_moe(module) and (
+            quantization_format is not QUANTIZATION_NONE and "awq" in quantization_format
+        ):
             # update_experts_avg_prequant_scale(module)
             grouped_experts = get_experts_list(module, model_type)
             for modules in grouped_experts: