IOobjectList does not fail gracefully when reading invalid FoamFiles

In my case, I use a file constant/turbulenceProperties.template to fill/select turbulence properties at run time. This is seemingly fine for all other utilities, i.e., the correct file, constant/turbulenceProperties is read. However, when running postProcess, the template file is loaded. It looks like this occurs because postProcess reads all objects in the constant directory (actually, all fields regardless of -fields argument).

selectedFields should be used in the executeFunctionObjects function, or the list of constantObjects be filtered gracefully. On the other hand, maybe I'm doing something unwise by putting a template file in there that sort of looks like a dictionary.