FromHoudiniGeometryConverter : Prefer `insert()` over `find()` and `[]`
FromHoudiniGeometryConverter : Prefer `insert()` over `find()` and `[]`

Combined with the previous commmit, this reduced extraction of an ~10 million poly production asset from 108s to 88s

appleseedhq/cortex,appleseedhq/cortex,appleseedhq/cortex