Fixed VectorDataTest to account for StringData repr change.
Fixed VectorDataTest to account for StringData repr change.

Python defaults to single quotes where possible, but we were using double quotes previously. There is no change in the result of an eval( repr() ) expression.

lento/cortex,hradec/cortex,hradec/cortex,goddardl/cortex,goddardl/cortex,appleseedhq/cortex,lento/cortex,lento/cortex,appleseedhq/cortex,hradec/cortex,goddardl/cortex,appleseedhq/cortex