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Chosing "About this system" from the help menu fails when there are no updates (ChangeSorter>>highestNumberedChangeSet returns nil). Here's a fix:
---- 'From Squeak 2.0 of May 22, 1998 on 25 May 1998 at 9:55:29 am'!
!ScreenController methodsFor: 'menu messages' stamp: 'tao 5/25/1998 09:54'! aboutThisSystem "Identify software version"
| aString eToySystem aNumber | aString _ Smalltalk version. (eToySystem _ Smalltalk at: #EToySystem ifAbsent: [nil]) ifNotNil: [aString _ aString, ' EToy System: ', eToySystem version, ' of ', eToySystem versionDate]. aNumber _ ChangeSorter highestNumberedChangeSet. (aNumber notNil and: [aNumber > 0]) ifTrue: [aString _ aString, ' Highest-numbered Change Set: ', aNumber printString]. ^ self inform: aString! !
-- tim
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