Edatool.tool_options.get() returns string "None" rather than NoneType

[shareefj]

This falls into the camp of "I don't know why this is happening" and wanted clarification on whether we're doing something wrong.

We've got a custom flist backend that uses a combination of TOOL_OPTIONS and backendargs to pass options to the backend. We're calling self.tool_options.get("<custom_option>") inside of our Edatool class and get back "None" for the options that haven't been set.

See the following line for the code: https://github.com/NuQuantum/edalize-plugins/blob/master/src/edalize/tools/flist.py#L55

I've looked through the code in Edalizer.parse_args and can't work out why it's returning a string. Is it intentional or perhaps there's something wrong with our option config.