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fix: Empty urls are not rewritten to relative requests

Prior to this commit, `urlToRequest` rewrote an empty URL `''` to `'./'` which is correct from a theoretical point of view since CSS files do not distinguish between relative paths starting with ./ or not (like CommonJS does). However, an empty URL is most likely an error which webpack should warn about. If we rewrite the empty string to ./, webpack won't warn against this anymore because requiring ./ is valid.

Related discussion: https://github.com/webpack/loader-utils/issues/80

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