Chartjs-Chart.js not working properly to draw lines when is only 1 bar

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Assign your label below value it will start working.

labels: ["Año 1","",""]

Below is the working sample code

<script style="text/javascript">
                var ctx2016_5857751099b04 = document.getElementById("myChart2016_5857751099b04");
                var myChart2016_5857751099b04 = new Chart(ctx2016_5857751099b04, {
                    type: 'bar',
                    data: {

            labels: ["Año 1","",""],
            datasets: [
                            {backgroundColor:'rgba(36, 143, 36,0)',borderColor:'rgba(75, 172, 198,1)',
                        type: 'line',
                        label: 'Meta',
                        data: [100,100,100],
                        options:  { tension:0.0, bezierCurve:false },borderWidth: 1,tension:0.25 },                         {backgroundColor:'rgba(51, 51, 26,0)',borderColor:'rgba(182, 87, 8,1)',
                        type: 'line',
                        label: 'Rango de aceptación ',
                        data: [90,90,90],
                        options:  { tension:0.0, bezierCurve:false },borderWidth: 1,tension:0.25 },                         {backgroundColor:['rgba(99, 33, 36 ,0.1)'],borderColor:['rgba(99, 33, 36, 1)'],
                        type: 'bar',
                        label: 'Porcentaje de proveedores evaluados satisfactoriamente ',
                        data: [100],
                        options:  { tension:0.0, bezierCurve:false },borderWidth: 1,tension:0.25 }          ]},
                options: {
                        tension:1,
                        scaleBeginAtZero: true,
                        scaleStartValue: 0,
                        scales: {
                            xAxes: [{
                                categorySpacing: 20,
                                gridLines: {
                                      color: "rgba(0, 0, 0, 0)",
                                  },
                            }],
                            yAxes: [{
                                categorySpacing: 20,
                                ticks: {
                                    beginAtZero:true
                                }
                            }]
                        }

                    }
                });
                </script>

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