fix #232

common/src/main/java/com/stardust/util/TextUtils.java

@@ -1,12 +1,22 @@
 package com.stardust.util;
 
+import android.support.annotation.NonNull;
+
 /**
  * Created by Stardust on 2017/5/3.
  */
 
 public class TextUtils {
 
-    public static String join(CharSequence delimiter, Object... tokens){
+    public static String join(CharSequence delimiter, Object... tokens) {
         return android.text.TextUtils.join(delimiter, tokens);
     }
+
+
+    @NonNull
+    public static String toEmptyIfNull(String message) {
+        if (message == null)
+            return "";
+        return message;
+    }
 }