Warning message when running measure test 'Cannot find current Workflow Step'

This error is logged in the following places:

• https://github.com/NREL/OpenStudio/blob/develop/src/measure/OSRunner.cpp#L196-L200
• https://github.com/NREL/OpenStudio/blob/develop/src/measure/OSRunner.cpp#L271-L275

It occurs when initializing runner = OpenStudio::Measure::OSRunner.new(OpenStudio::WorkflowJSON.new)
and then calling measure.run(model, runner, argument_map).

Results in warning 'Cannot find current Workflow Step'

The previous lines come with the template unit test files for new measures.

Seems like we could remove the warnings from OSRunner.cpp altogether, but here are some notes from @macumber :

id rather give the runner an extra flag like 'testingMode = true' than completely remove that check
then we could raise the warning to an error and not give the issue in testing mode
although measures using the runner would not be able to get the current step
so maybe a better method is one that automatically creates a workflow with the current measure

@shorowit