Merge pull request #717 in DESIGN/design from ~ZACK/design:release/10.0 to release/10.0

* commit 'bd65d47a210a6f8b5ce022ea79fe52f8feb70a39':
  REPORT-10829  装了日志插件后设计器无法关闭

designer-base/src/main/java/com/fr/design/mainframe/loghandler/LogMessageBar.java

@@ -69,8 +69,11 @@ public class LogMessageBar extends JPanel {
 		return new Dimension(width, 24);
 	}
 
+	/**
+	 * 销毁内置的日志面板,外部插件会用到
+	 */
 	public void disposeLogDialog() {
-		if (dlg != null) {
+		if (dlg != null && dlg.isShowing()) {
 			dlg.dispose();
 		}
 		THIS = null;