Bug fixing: Linking on last row in lesion table is broken

LesionTracker/client/components/viewerMain/viewerMain.js

@@ -70,27 +70,28 @@ Template.viewerMain.helpers({
 
 Template.viewerMain.events({
     'click button#clearTools': function(e, template) {
-        var contentId = template.data.contentId;
         var patientId = template.data.studies[0].patientId;
         var toolTypes = ["lesion", "nonTarget"];
         var toolState = cornerstoneTools.globalImageIdSpecificToolStateManager.toolState;
         var toolStateKeys = Object.keys(toolState).slice(0);
 
+        // Set null array for toolState data found by imageId and toolType
         toolStateKeys.forEach(function (imageId) {
             toolTypes.forEach(function (toolType) {
-                if(toolState[imageId][toolType]) {
-                    if(toolState[imageId][toolType].data[0].patientId === patientId) {
+                var toolTypeData = toolState[imageId][toolType];
+                if(toolTypeData && toolTypeData.data.length > 0) {
+                    if(toolTypeData.data[0].patientId === patientId) {
                         toolState[imageId][toolType] = {
                             data: []
-                        }
+                        };
                     }
                 }
             });
-
         });
 
+
         // Update imageViewerViewport elements
-        $("#"+contentId+" .imageViewerViewport").each(function(viewportIndex, element) {
+        $(".imageViewerViewport").each(function(viewportIndex, element) {
             cornerstone.updateImage(element);
         });