* fix kindeditor placeholder not work.

dist/lib/kindeditor/kindeditor.js

@@ -10102,6 +10102,7 @@ KindEditor.plugin('pasteimage', function(K) {
                 var oldPlaceholder = self.getPlaceholder();
                 if (!oldPlaceholder) oldPlaceholder = placeholder;
                 else if (oldPlaceholder.indexOf(placeholder) < 0) placeholder = oldPlaceholder + '\n' + placeholder;
+                self.setPlaceholder(placeholder);
             }
         }
 
@@ -11103,7 +11104,7 @@ KindEditor.plugin('table', function (K) {
         // 获取用户拖选的单元格
         self.plugin.getSelectedCells = function () {
             var table = self.plugin.getSelectedTable();
-            if (table.length) {
+            if (table && table.length) {
                 var cells = K('.ke-select-cell', table.get(0));
                 if (cells && cells.length > 1) {
                     return cells;

src/js/kindeditor/plugins/advance-table.js

@@ -891,7 +891,7 @@ KindEditor.plugin('table', function (K) {
         // 获取用户拖选的单元格
         self.plugin.getSelectedCells = function () {
             var table = self.plugin.getSelectedTable();
-            if (table.length) {
+            if (table && table.length) {
                 var cells = K('.ke-select-cell', table.get(0));
                 if (cells && cells.length > 1) {
                     return cells;

src/js/kindeditor/plugins/paste-image.js

@@ -58,6 +58,7 @@ KindEditor.plugin('pasteimage', function(K) {
                 var oldPlaceholder = self.getPlaceholder();
                 if (!oldPlaceholder) oldPlaceholder = placeholder;
                 else if (oldPlaceholder.indexOf(placeholder) < 0) placeholder = oldPlaceholder + '\n' + placeholder;
+                self.setPlaceholder(placeholder);
             }
         }