[Enhancement] change the null reference to empty object in UrlMappingPattern.java

[nikam14]

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• I had searched in the issues and found no similar issues.

Enhancement Request

Null is a reference that does not point to any object.
returning an empty object can help to improve the readability and maintainability of code

Describe the solution you'd like

location - eventmesh-admin/eventmesh-admin-rocketmq/src/main/java/org/apache/eventmesh/admin/rocketmq/util/UrlMappingPattern.java
line - 63
expected-

Are you willing to submit PR?

• Yes I am willing to submit a PR!

[heliang666s]

hello,I am new in there,I will try it,please assign me,thanks~

[Pil0tXia]

@heliang666s Welcome! This issue is open for contribution.

[Pil0tXia]

Closed according to #4846 (comment).