v1.39 normal map nodes missing object space functionality available in v1.38

[klucknav]

The v1.38 normal map nodes had a space input that allowed the normal vectors to be treated as though they were either in tangent or object space. The 1.39 version of the normal map nodes removed this input. However, the version upgrade function simply removes the input and does not do anything to preserve the behavior if the non-default object space was authored. This means that if our v1.38 normal map node was using object space, when we use this node with v1.39 we will get incorrect results.

[jstone-lucasfilm]

Thanks for posting this issue, @klucknav, and I've written up a proposed fix in #2251.