Potential NPE in ACL plain

[ErrReporter]

BUG REPORT

1. Please describe the issue you observed:

Our code analyses found the following potential NPE:

• Return null to caller
  

  rocketmq/acl/src/main/java/org/apache/rocketmq/acl/common/AclUtils.java

  Line 276 in b4240d5

  return null;

• Function getYamlDataObject executes and returns
  

  rocketmq/acl/src/main/java/org/apache/rocketmq/acl/plain/PlainPermissionManager.java

  Line 134 in b4240d5

  Map<String, Object> aclAccessConfigMap = AclUtils.getYamlDataObject(fileHome + File.separator + fileName,

• aclAccessConfigMap is passed as the this pointer to function java.util.Map.get (aclAccessConfigMap can be null)
  

  rocketmq/acl/src/main/java/org/apache/rocketmq/acl/plain/PlainPermissionManager.java

  Line 137 in b4240d5

  List<Map<String, Object>> accounts = (List<Map<String, Object>>) aclAccessConfigMap.get(AclConstants.CONFIG_ACCOUNTS);

Commit: b4240d5

2. Please tell us about your environment:
   N/A

3. Other information (e.g. detailed explanation, logs, related issues, suggestions how to fix, etc):

[panzhi33]

would you like to submit a PR to fix it?

[shendongsd]

would you like to submit a PR to fix it?

Does anyone solve this problem now，could I submit a PR to fix it?

[ErrReporter]

would you like to submit a PR to fix it?

Does anyone solve this problem now，could I submit a PR to fix it?

Not yet. Would you please submit the PR? Thanks.

[shendongsd]

would you like to submit a PR to fix it?

Does anyone solve this problem now，could I submit a PR to fix it?

Not yet. Would you please submit the PR? Thanks.
OK