fixed janus throwing error when setting the count to 0 and applying/d…

[abessiari]

So now we return if count is 0 in_config_file is set false.
This will the place to get the nodes and uninstall janus ....
We can add that logic later and invoke the destroy hook ezra mentioned ...

    def _validate_resource(self, resource: dict):
        assert resource.get(Constants.LABEL)
        assert resource.get(Constants.RES_TYPE) in Constants.RES_SUPPORTED_TYPES
        assert resource.get(Constants.RES_NAME_PREFIX)
        creation_details = resource[Constants.RES_CREATION_DETAILS]

        # count was set to zero 
        if not creation_details['in_config_file']:
            # TODO HANDLE UNINSTALL OF JANUS ON NODES ...
            return

        assert resource.get(Constants.RES_COUNT, 1)
        assert resource.get(Constants.RES_IMAGE)
        self.logger.info(f"Validated:OK Resource={self.name} using {self.label}")