修改 主单号校验

@@ -3,12 +3,16 @@ package com.tianbo.util.nmms;
 public class AwbaUtils {
 
     public static String awba(String awba){
-        if (awba.contains("-")){
-            return awba;
-        }else {
-           StringBuffer stringBuffer = new StringBuffer(awba);
-            String s = stringBuffer.insert(3, "-").toString();
-            return s;
+
+        if (!"".equals(awba) && null != awba){
+            if (awba.contains("-")){
+                return awba;
+            }else {
+                StringBuffer stringBuffer = new StringBuffer(awba);
+                String s = stringBuffer.insert(3, "-").toString();
+                return s;
+            }
         }
+        return awba;
     }
 }