Describe the bug

The irrelevant error returned when requesting illegal URL, like: "tel:484-695-3408"

TypeError: Cannot read property 'replace' of null
    at dispatchHttpRequest (node_modules/axios/lib/adapters/http.js:109:74)
    at new Promise (<anonymous>)
    at httpAdapter (node_modules/axios/lib/adapters/http.js:46:10)
    at dispatchRequest (node_modules/axios/lib/core/dispatchRequest.js:52:10)

To Reproduce

axios.get('tel:484-695-3408').catch(err => console.error(err));

Expected behavior

Return descriptive error, like "Unsupported protocol tel:"

Environment

• Axios Version: 0.21.1
• Adapter: HTTP
• Browser: none
• Browser Version: none
• Node.js Version: 12.19.0
• OS: MacOS 10.14
• Additional Library Versions: none

Additional context/Screenshots

none