[Issue 21707] std.base64: Faulty input creates range error instead of Base64Exception

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21707

Berni44 <bugzilla at bernis-buecher.de> changed:

           What    |Removed                     |Added
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             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #4 from Berni44 <bugzilla at bernis-buecher.de> ---
I had to revert my fix from yesterday, because it introduced a regression.

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