短路问题：user != nil && user.id > book.id && (nil + 1 > 3)

```java
public static void main(String[] args) {
    boolean result = (boolean) AviatorEvaluator.execute("user != nil && user.id > book.id && (nil + 1 > 3)");
    System.out.println(result);
}
```
希望短路并返回false，但是抛了异常：
```
Exception in thread "main" com.googlecode.aviator.exception.ExpressionRuntimeException: Could not add <Nil, null> with <Long, 1>
	at com.googlecode.aviator.runtime.type.AviatorObject.add(AviatorObject.java:153)
	at com.googlecode.aviator.runtime.type.AviatorNil.add(AviatorNil.java:51)
	at com.googlecode.aviator.lexer.token.OperatorType.eval(OperatorType.java:108)
	at com.googlecode.aviator.runtime.op.OperationRuntime.eval0(OperationRuntime.java:57)
	at com.googlecode.aviator.runtime.op.OperationRuntime.eval(OperationRuntime.java:47)
	at com.googlecode.aviator.code.OptimizeCodeGenerator.executeOperator(OptimizeCodeGenerator.java:221)
	at com.googlecode.aviator.code.OptimizeCodeGenerator.execute(OptimizeCodeGenerator.java:158)
	at com.googlecode.aviator.code.OptimizeCodeGenerator.getResult(OptimizeCodeGenerator.java:361)
```

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短路问题：user != nil && user.id > book.id && (nil + 1 > 3) #695

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短路问题：user != nil && user.id > book.id && (nil + 1 > 3) #695

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