Don't display serialout settings unless a serialout device is present.

web/plates/js/settings.js

@@ -17,8 +17,10 @@ function SettingsCtrl($rootScope, $scope, $state, $location, $window, $http) {
 		settings = angular.fromJson(data);
 		// consider using angular.extend()
 		$scope.rawSettings = angular.toJson(data, true);
+		$scope.visible_serialout = false;
 		if ((settings.SerialOutputs !== undefined) && (settings.SerialOutputs !== null) && (settings.SerialOutputs['/dev/serialout0'] !== undefined)) {
 			$scope.Baud = settings.SerialOutputs['/dev/serialout0'].Baud;
+			$scope.visible_serialout = true;
 		}
 		$scope.UAT_Enabled = settings.UAT_Enabled;
 		$scope.ES_Enabled = settings.ES_Enabled;

web/plates/settings.html

@@ -92,7 +92,7 @@
 						<input class="col-xs-7" type="number_format" required ng-model="PPM" placeholder="integer" ng-blur="updateppm()" />
 					</form>
 				</div>
-				<div class="form-group reset-flow">
+				<div class="form-group reset-flow" ng-class="{ 'section_invisible': (!visible_serialout)}">
 					<label class="control-label col-xs-5">Serial Output Baudrate</label>
 					<form name="ppmForm" ng-submit="updateBaud()" novalidate>
 						<!-- type="number" not supported except on mobile -->