Fix label showing up when Axes are configured to not be displayed (#8697)

This should close the issue #8695

public/app/plugins/panel/graph/graph.ts

@@ -145,14 +145,14 @@ coreModule.directive('grafanaGraph', function($rootScope, timeSrv, popoverSrv) {
         }
 
         // add left axis labels
-        if (panel.yaxes[0].label) {
+        if (panel.yaxes[0].label && panel.yaxes[0].show) {
           var yaxisLabel = $("<div class='axisLabel left-yaxis-label flot-temp-elem'></div>")
           .text(panel.yaxes[0].label)
           .appendTo(elem);
         }
 
         // add right axis labels
-        if (panel.yaxes[1].label) {
+        if (panel.yaxes[1].label && panel.yaxes[1].show) {
           var rightLabel = $("<div class='axisLabel right-yaxis-label flot-temp-elem'></div>")
           .text(panel.yaxes[1].label)
           .appendTo(elem);