UILabel空指针bug修复

designer-base/src/main/java/com/fr/design/gui/ilable/UILabel.java

@@ -84,7 +84,7 @@ public class UILabel extends JLabel implements UITextComponent {
 			return;
 		}
 		String text = this.getText();
-		if (text.length() > 1 && text.charAt(text.length() - 1) == ':') {
+		if (StringUtils.isNotEmpty(text) && text.length() > 1 && text.charAt(text.length() - 1) == ':') {
 			text = ":" + text.substring(0, text.length() - 1);
 			this.setText(text);
 		}