nit: keyerror exception handling

[myungjin]

Description

There is a chance that remove_world in world_manager is called twice. The funcall call removes a key from worlds_stores. So, the second call leads to KeyError. We currently can't ensure call the function only once because the current remove_world is not clean due to a deadlock issue. So, we mask the key error.

Type of Change

• [x] Bug Fix
• [ ] New Feature
• [ ] Breaking Change
• [ ] Refactor
• [ ] Documentation
• [ ] Other (please describe)

Checklist

• [ ] I have read the contributing guidelines
• [ ] Existing issues have been referenced (where applicable)
• [ ] I have verified this change is not present in other open pull requests
• [ ] Functionality is documented
• [ ] All code style checks pass
• [ ] New code contribution is covered by automated tests
• [ ] All new and existing tests pass