Editor: fix removeRow bug

When OnDemandList is pruning rows it sometimes calls 'removeRow' on a preload
node. Editor's 'removeRow' logic assumes that the node will always be a
valid row node which causes an error when it is not. This commit adds a guard
in `Editor#removeRow` to ensure that a dgrid row object for the node exists.

Also disable the verbose logging in the Rest.html test file by default.

Editor.js

@@ -79,8 +79,9 @@ define([
 		removeRow: function (rowElement) {
 			var self = this;
 			var focusedCell = this._focusedEditorCell;
+			var row = this.row(rowElement);
 
-			if (focusedCell && focusedCell.row.id === this.row(rowElement).id) {
+			if (focusedCell && row && focusedCell.row.id === row.id) {
 				this._previouslyFocusedEditorCell = focusedCell;
 				// Pause the focusout handler until after this row has had
 				// time to re-render, if this removal is part of an update.

test/Rest.html

@@ -63,6 +63,7 @@ <h2>A basic grid with Rest store using range headers</h2>
 			], function (lang, Deferred, query, List, Grid, Selection, Editor, Keyboard, Tree,
 				SelectServer, Rest, Trackable, Cache, TreeStore) {
 
+				var ENABLE_DEBUG_LOG = false; // set to true to enable logging preload info
 				var selectServer = new SelectServer({}, document.getElementById('selectServerForm'));
 
 				selectServer.startup();
@@ -80,7 +81,7 @@ <h2>A basic grid with Rest store using range headers</h2>
 
 						logPreload: function () {
 							var line = '';
-							for (var i = 0; i < 160; i++) {
+							for (var i = 0; i < 100; i++) {
 								line += '\u2500';
 							}
 							console.log(line);
@@ -107,14 +108,12 @@ <h2>A basic grid with Rest store using range headers</h2>
 									});
 									preload = preload.next;
 								}
-								console.table && console.table(preloads);
-								console.table && console.table(preloadNodes);
+								console.table(preloads);
+								console.table(preloadNodes);
 								var realRowCount = query('.dgrid-row', grid.contentNode).length;
 								height += 24 * realRowCount;
 								totalPossibleRows += realRowCount;
 								console.log('Height calculated from preloads = ', height);
-
-
 								console.log('Actual grid content height = ', gridContentHeight());
 								console.log('Total possible rows = ', totalPossibleRows);
 								console.log('Current row count = ', realRowCount);
@@ -158,14 +157,17 @@ <h2>A basic grid with Rest store using range headers</h2>
 
 					var refreshed = false;
 					var prevContentHeight = 0;
-					setInterval(function () {
-						var contentHeight = gridContentHeight();
-						if (refreshed || prevContentHeight != contentHeight) {
-							prevContentHeight = contentHeight;
-							refreshed = false;
-							grid.logPreload();
-						}
-					}, 1500);
+
+					if (ENABLE_DEBUG_LOG) {
+						setInterval(function () {
+							var contentHeight = gridContentHeight();
+							if (refreshed || prevContentHeight != contentHeight) {
+								prevContentHeight = contentHeight;
+								refreshed = false;
+								grid.logPreload();
+							}
+						}, 1500);
+					}
 
 					function gridContentHeight() {
 						var contentHeight = 0;