ofShader: how to only load fragment shader? (not vertex)

According to the doc, I need both a fragment and vertex shader to setup an ofShader.
OpenGL should not require both, so is there a way to only load a fragment shader? (having passthrough vertex shaders to make it work is not a solution for me)

The code I included in here lets you include a shader within the code (how I like to do things while testing)