Fix: $parsed_requested_path['path'] doesn't always exits

[dinhtungdu]

Description of the Change

In #196 we add a feature to redirect URL with params. We parse URL in that feature and assume that the parsed path always exists, but parse_url can return false in some edge cases. So this PR adds a check to cover those cases.

Fixes #244.

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.