Yes, by default this pin doesn't have a default color (or another type) node. You must add it yourself. The same happens in Standalone, as you can see in the attached image.
The plugin works with the standard Octane API to configure all the default nodes and values, so if this API doesn't provide a default node for a parameter, the plugin is not going to build it, like happens in the Standalone.
Computer Graphics Software Developer
Octane plugin development and support: LightWave and Houdini