Returns the assetAttrValue in order of the asset path tree. Returns None if the assetAttrValue isn't found.

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### Parameters
**assetPath** `String`: Path of the asset to begin search from<br />
**assetAttrName** `String`: Name of the attribute to search for<br />

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### Returns
**assetAttrValue** `String` The value found or None<br />

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### Example
```python
# Example Usage:
assetPath = 'Kanoa Industries\Adelaide Hills\Packagin\Line 1'
assetAttrValue = system.kanoa.asset.getClosestAncestorAttribute(assetPath, '_ProductionDay')
```