fix: pass both tree parent nodes and children nodes when exporting

Fix export all data to excel with treeview bug. Example: http://plnkr.co/edit/hFPAO6W3EW8nlzt2

fix #7127, fix #6819

Author: alancqueiroz

packages/exporter/src/js/exporter.js

@@ -952,21 +952,24 @@
          * recurse down into the children to get to the raw data element
          * which is a row without children (a leaf).
          * @param {Node} aNode the tree node on the grid
-         * @returns {Array} an array of leaf nodes
+         * @returns {Array} an array with all child nodes from aNode
          */
         getRowsFromNode: function(aNode) {
           var rows = [];
-          for (var i = 0; i<aNode.children.length; i++) {
-            if (aNode.children[i].children && aNode.children[i].children.length === 0) {
-              rows.push(aNode.children[i]);
-            } else {
-              var nodeRows = this.getRowsFromNode(aNode.children[i]);
-              rows = rows.concat(nodeRows);
-            }
+
+          // Push parent node if it is not undefined and has values other than 'children'
+          var nodeKeys = aNode ? Object.keys(aNode) : ['children'];
+          if (nodeKeys.length > 1 || nodeKeys[0] != 'children') {
+            rows.push(aNode);
+          }
+
+          if (aNode && aNode.children && aNode.children.length > 0) {
+              for (var i = 0; i < aNode.children.length; i++) {
+                  rows = rows.concat(this.getRowsFromNode(aNode.children[i]));
+              }
           }
           return rows;
         },
-
         /**
          * @ngdoc function
          * @name getDataSorted

packages/exporter/test/exporter.spec.js

@@ -871,6 +871,14 @@ describe('ui.grid.exporter', function() {
           {col1: 'a_4', col2: 'b_4', col3: 'c_4', children: []}
         ]);
       });
+      it('should return partent rows when they have their own data', function() {
+        var bNode = {col1: 'a_1', col2: 'b_1', children: [{col1: 'a_2', col2: 'b_2', col3: 'c_2', children: []}]};
+
+        expect(uiGridExporterService.getRowsFromNode(bNode)).toEqual([
+          {col1: 'a_1', col2: 'b_1', children: [{col1: 'a_2', col2: 'b_2', col3: 'c_2', children: []}]},
+          {col1: 'a_2', col2: 'b_2', col3: 'c_2', children: []}
+        ]);
+      });
     });
 
     describe('getDataSorted', function() {