fix: Dummy filenames may not contain a file extension, remove it only if it exists (DEV-4227)

[seakayone]

Pull Request Checklist

Task Description/Number

Fixes an occurence of a StringIndexOutOfBoundsException:

{"name":"org.knora.webapi.http.handler.KnoraExceptionHandler$","timestamp":"2024-12-10T16:05:57.392932872Z  ","level":"ERROR","thread":"zio-fiber-1856268975","message":"Unable to run route /v2/resources","cause":"Exception in thread \"zio-fiber-\" java.lang.StringIndexOutOfBoundsException: Range [0, -1) out of bounds for length 0
\tat java.base/jdk.internal.util.Preconditions$1.apply(Unknown Source)
\tat java.base/jdk.internal.util.Preconditions$1.apply(Unknown Source)
\tat java.base/jdk.internal.util.Preconditions$4.apply(Unknown Source)
\tat java.base/jdk.internal.util.Preconditions$4.apply(Unknown Source)
\tat java.base/jdk.internal.util.Preconditions.outOfBounds(Unknown Source)
\tat java.base/jdk.internal.util.Preconditions.outOfBoundsCheckFromToIndex(Unknown Source)
\tat java.base/jdk.internal.util.Preconditions.checkFromToIndex(Unknown Source)
\tat java.base/java.lang.String.checkBoundsBeginEnd(Unknown Source)
\tat java.base/java.lang.String.substring(Unknown Source)
\tat org.knora.webapi.messages.v2.responder.valuemessages.ValueContentV2$.fileInfoFromExternal$$anonfun$1$$anonfun$1$$anonfun$1(ValueMessagesV2.scala:717)
\tat zio.ZIO$.fromEither$$anonfun$1(ZIO.scala:3680)","logger_name":"org.knora.webapi.http.handler.KnoraExceptionHandler$","org.knora.webapi.http.handler.KnoraExceptionHandler$":"1ms"}

Issue Number: DEV-

PR Type

• build/chore: maintenance tasks (no production code change)
• docs: documentation changes (no production code change)
• feat: represents new features
• fix: represents bug fixes
• perf: performance improvements
• refactor: represents production code refactoring
• test: adding or refactoring tests (no production code change)
• deprecated: Deprecation warning (ideally referencing a migration guide)

Basic requirements for bug fixes and features

• Tests for the changes have been added
• Docs have been added / updated

Does this PR introduce a breaking change?

• Yes

[linear]

DEV-4227 Seeing existing images only possibly via IIIF URL new tab, uploading only via external IIIF URL

[siers]

by the way, this looks like a filename.split('.').lift(0).getOrElse(filename)

[seakayone]

Yes, that could work as well. Thanks for the hint.