修复bug：条件显示里设置条件内容为数据列，把对应的数据集删掉后，点击设置的条件属性，页面打不开

designer_base/src/com/fr/design/editor/editor/ColumnSelectedEditor.java

@@ -36,6 +36,8 @@ public class ColumnSelectedEditor extends Editor<SimpleDSColumn> {
 
 			@Override
 			public void itemStateChanged(ItemEvent e) {
+				TableDataWrapper tableDataWrapper = tableDataComboBox.getSelectedItem();
+				if (tableDataWrapper != null) {
 					//这边需要重新初始化columnNames, 否则nameList长度和columnNames长度不同导致出錯。
 					List<String> nameList = tableDataComboBox.getSelectedItem().calculateColumnNameList();
 					columnNames = new String[nameList.size()];
@@ -46,6 +48,7 @@ public class ColumnSelectedEditor extends Editor<SimpleDSColumn> {
 					}
 					columnNameComboBox.validate();
 				}
+			}
 		});
 		columnNameComboBox = new UIComboBox();
 		tableDataComboBox.setPreferredSize(new Dimension(82, 20));