armor against null or empty miner config

routes/baseActionsRouter.js

@@ -544,11 +544,13 @@ router.get("/address/:address", function(req, res) {
 		}
 	}
 
+	if (global.miningPoolsConfigs) {
 		for (var i = 0; i < global.miningPoolsConfigs.length; i++) {
 			if (global.miningPoolsConfigs[i].payout_addresses[address]) {
 				res.locals.payoutAddressForMiner = global.miningPoolsConfigs[i].payout_addresses[address];
 			}
 		}
+	}
 
 	coreApi.getAddress(address).then(function(validateaddressResult) {
 		res.locals.result.validateaddress = validateaddressResult;