Since you continue with '^ nil' anyways, probably it should be a  (resumable) Warning instead of an Error?

Best regards
	-Tobias
> On 07.12.2017, at 12:21, commits at source.squeak.org wrote:
> 
> Patrick Rein uploaded a new version of Multilingual to project The Trunk:
> http://source.squeak.org/trunk/Multilingual-pre.232.mcz
> 
> ==================== Summary ====================
> 
> Name: Multilingual-pre.232
> Author: pre
> Time: 7 December 2017, 12:21:07.824608 pm
> UUID: 8a517ab7-5c79-b84f-976c-6bfb7b07f0d8
> Ancestors: Multilingual-pre.231
> 
> Adds the signaling of the NoConverterFound exception (was missing from previous commit due to porting from another image).
> 
> =============== Diff against Multilingual-pre.231 ===============
> 
> Item was changed:
>  ----- Method: TextConverter class>>newForEncoding: (in category 'instance creation') -----
>  newForEncoding: aString 
>  	| class encoding |
>  	aString ifNil: [^ ISO88591TextConverter new].
>  	encoding := aString asLowercase.
>  	class := self allSubclasses
>  				detect: [:each | each encodingNames includes: encoding]
>  				ifNone: [].
>  	class isNil
> + 		ifTrue: [NoConverterFound signalFor: aString. ^ nil].
> - 		ifTrue: [^ nil].
>  	^ class new!
> 
>