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* Host-generator template is generating a null value like below when host catalogue is not having any mac value for the interface. ethernet_mac_address: <no value> * added another condition to ethernet_mac_address generation logic so generate only if macAddresses is provided and if it has value for the respective interface ( oam, pxe ...) Closes: #404 Change-Id: I2fafe5ceaa4c58855a17929c1c41d60045d1675a