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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def process_module_output(self, module):
 """ Process the output for a module and return a json string representing it. Color processing occurs here. """

        outputs = module["module"].get_latest()
        color = module["color"]
        if color:
            for output in outputs:
                # Color: substitute the config defined color
                if "color" not in output:
                    output["color"] = color
        # Create the json string output.
        return ",".join([dumps(x) for x in outputs])