Ensures dependencies have been met before delegating to `self.invoke`.

def process(self, broker):
        """
        Ensures dependencies have been met before delegating to `self.invoke`.
        """
        if any(i in broker for i in IGNORE.get(self.component, [])):
            raise SkipComponent()
        missing = self.get_missing_dependencies(broker)
        if missing:
            raise MissingRequirements(missing)
        return self.invoke(broker)