Phillip Webb 0856e10443 Fix IndexOutOfBoundsException exception from parseUrl with empty spec
Update jar `Handler` code so that the `parseUrl` method can accept an
empty `spec`. Prior to this commit, a `classLoader.getResource("")`
call would result in a `null` result. This breaks a number of things
including `ClassPathResource` and `PathMatchingResourcePatternResolver`.

Fixes gh-38524
2023-11-23 14:35:04 -08:00
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