updating get_color_str() signature to only pass model_instance, since the given legend is 'user-defined' the user should know what fields of the model they want to use to calculate the color returned.
updating get_color_str() signature to only pass model_instance, since the given legend is 'user-defined' the user should know what fields of the model they want to use to calculate the color returned.

monkut/tmstiler