Delete Space in select Angularjs

Good day I have the following problem, when I consume my service REST from the angle he brings me the 3 types of documents, but when painting them on the front, he shows me at the beginning a space.

This is my html:

<label for="documento">Documento de Identidad*</label>
            <select ng-model="contenido.tipoDocumento" ng-model="user.tipoDocumento" name="tipoDocumento" >
                    <option ng-repeat="option in listaTiposDoc" value="{{option.nombre}}">{{option.nombre}}</option>
                </select>

part of the service in the controller:

servicioRest.getParametros().then(function (data) {
    $scope.config.parametros = data;

     //Obtenemos los tipos de documento
    $scope.config.urlService = endPoint+$scope.config.parametros.contexto;
         servicioRest.getTiposDocumento($scope.config).then(function(dataDocumentos){
            $scope.listaTiposDoc = dataDocumentos;
        });
});

When I do a debug he shows me what he brings from the service like this:

but the result is a space at the beginning that I do not know how to remove it:

Thanks.

Media Solution:

I solved it by setting from the beginning, the value of:

$scope.contenido.tipoDocumento = 'CC';

From the controller, so it loads without spaces, it is worth clarifying that the solution is for when said value is within the options of the select.

$scope.contenido.tipoDocumento = 'CC';

servicioRest.getParametros().then(function (data) {
    $scope.config.parametros = data;

     //Obtenemos los tipos de documento
    $scope.config.urlService = endPoint+$scope.config.parametros.contexto;
         servicioRest.getTiposDocumento($scope.config).then(function(dataDocumentos){
            $scope.listaTiposDoc = dataDocumentos;
        });
});

I do not know if it will be the best practice but it is working OK.