[电表][修复]:过滤没有签名的请求

mallinkCallback/src/main/java/com/iformall/controller/device/KwBoxV1Controller.java

@@ -105,6 +105,10 @@ public class KwBoxV1Controller extends BaseController {
 	}
 
 	private boolean checkSign(KwBox kwBox, Map<String,Object> paramMap, String sign) {
+
+		if (sign == null)
+			return false;
+
 		HmacUtils hmacUtils = new HmacUtils(HmacAlgorithms.HMAC_SHA_1, kwBox.getComKey());
 		String content = JSONObject.toJSON(paramMap).toString();
 		String signCom = hmacUtils.hmacHex(content);