`MimeTypeUtils` raises `StringIndexOutOfBoundsException` for some invalid mime types

[JGiard]

Since version 7.0.8 of spring-core and the bug fix in commit 41cd687, MimeTypeUtils raises a StringIndexOutOfBoundsException instead of an InvalidMimeTypeException when parsing certain invalid mime types.

Attempting to parse "application/xml" (the quotes are part of the value) raises a StringIndexOutOfBoundsException and Spring returns a 500 internal server error.

I believe there is an unaccounted case where nextIndex = 0 in mimeType.charAt(nextIndex - 1) if the value starts with a double quote.

[sbrannen]

Hi @JGiard,

Congratulations on submitting your first issue for the Spring Framework, and good catch! 👍

We'll get this regression fixed for inclusion in 7.0.9