correct current path when there is no parent

now no need to include empty string to hide last label on the barpath

Author: archmoj

src/traces/sunburst/plot.js

@@ -567,9 +567,11 @@ exports.attachFxHandlers = function(sliceTop, entry, gd, cd, styleOne, constants
                 if(hasFlag('value')) thisText.push(hoverPt.valueLabel);
             }
 
-            hoverPt.currentPath = pt.currentPath = helpers.getPath((pt.parent || pt).data);
-            if(hasFlag('current path')) {
-                thisText.push(hoverPt.currentPath);
+            if(pt.parent) {
+                hoverPt.currentPath = pt.currentPath = helpers.getPath(pt.parent.data);
+                if(hasFlag('current path')) {
+                    thisText.push(hoverPt.currentPath);
+                }
             }
 
             var tx;

src/traces/treemap/draw_ancestors.js

@@ -116,7 +116,6 @@ module.exports = function drawAncestors(gd, cd, entry, slices, opts) {
         });
 
         var tx = helpers.getLabelStr(pt.data.data.label);
-        if(!pt.children) tx = ' '; // don't display last label on the menu - should use space instead of empty string
 
         sliceText.text(tx)
             .classed('slicetext', true)