Fixed bug whereby VectorParameterUI.replace() would try to access non-existent variables if the parameter has presetsOnly==True.
Fixed bug whereby VectorParameterUI.replace() would try to access non-existent variables
if the parameter has presetsOnly==True.


davidsminor/cortex,davidsminor/cortex,hradec/cortex,danieldresser/cortex,goddardl/cortex,appleseedhq/cortex,goddardl/cortex,davidsminor/cortex,hradec/cortex,lento/cortex,danieldresser/cortex,appleseedhq/cortex,danieldresser/cortex,lento/cortex,danieldresser/cortex,hradec/cortex,davidsminor/cortex,appleseedhq/cortex,lento/cortex,goddardl/cortex