添加空表达式

developframework · developframework · commit 4fa755c41297 · 2017-05-08T22:41:55.000+08:00
diff --git a/src/main/java/com/github/developframework/expression/Expression.java b/src/main/java/com/github/developframework/expression/Expression.java
@@ -69,7 +69,7 @@ public static final Expression parse(String expressionValue) {
                 return parseSingle(expressionValue);
             }
         }
-        return null;
+        return EMPTY_EXPRESSION;
     }
 
     /**

Original file line number	Diff line number	Diff line change
`@@ -69,7 +69,7 @@ public static final Expression parse(String expressionValue) {`
`69`	`69`	`return parseSingle(expressionValue);`
`70`	`70`	`}`
`71`	`71`	`}`
`72`		`- return null;`
	`72`	`+ return EMPTY_EXPRESSION;`
`73`	`73`	`}`
`74`	`74`
`75`	`75`	`/**`