do not delete hoverlabel when hovertemplate is defined

Author: antoinerg

src/components/fx/hover.js

@@ -957,8 +957,9 @@ function createHoverText(hoverData, opts, gd) {
         if(d.extraText !== undefined) text += (text ? '<br>' : '') + d.extraText;
 
         // if 'text' is empty at this point,
+        // and hovertemplate is not defined,
         // put 'name' in main label and don't show secondary label
-        if(text === '') {
+        if(text === '' && !d.hovertemplate) {
             // if 'name' is also empty, remove entire label
             if(name === '') g.remove();
             text = name;

test/jasmine/tests/pie_test.js

@@ -1084,6 +1084,7 @@ describe('pie hovering', function() {
         });
 
         it('should use hovertemplate if specified', function(done) {
+            mockCopy.data[0].name = '';
             Plotly.plot(gd, mockCopy.data, mockCopy.layout)
             .then(_hover)
             .then(function() {