[ISSUE #4136] change the null reference to empty object in UrlMappingPattern.java

[heliang666s]

Motivation

change the null reference to empty object in UrlMappingPattern.java Fixes #4136

Modifications

change return null to a empty map

Documentation

No

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[github-actions]

Welcome to the Apache EventMesh (incubating) community!!
This is your first PR in our project. We're very excited to have you onboard contributing. Your contributions are greatly appreciated!

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[mxsm]

LGTM, Welcome to EventMesh community

[mxsm]

@heliang666s The code is all right, please repair the CI. You can synchronize the eventmesh project in your own repository to the master branch, then pull a branch for development based on the master branch, and finally submit the PR to merge into the master branch of Eventmesh.

[Pil0tXia]

@heliang666s

The target branch you merge this PR into should be master instead of develop. By then you should be able to pass CI.

Developing with a branch that corresponds to a single issue minimizes the chance that you'll run into any Git difficulties.

By the way, kindly refer to the standard title format used in other PRs.

@mxsm How about delete this outdated develop branch?

The base branch was changed.

[Pil0tXia]

@heliang666s Please resolve conflicts.

@mxsm The The base branch was changed. comment was a automatic message sent by GitHub.