Author was removed in Pharo 13: disregard setting the author when using version 13...

Author: Johan Brichau

repository/Seaside-Pharo-Development.package/WADevelopment.class/class/ensureAuthorInitialsWith..st

@@ -7,7 +7,8 @@ ensureAuthorInitialsWith: aOneArgumentBlock
 		ifTrue: [
 			"Special Pharo code path to avoid deprecation"
 			| author |
-			author := Smalltalk at: #Author.
+			SystemVersion current major >= 13 ifTrue:[ ^ self. "do nothing because Author does not exist anymore" ].
+			author := Smalltalk at: #Author ifAbsent: [ nil ].
 			author isNil
 				ifTrue: [ ^ self error: 'unsupported Pharo version' ].
 			author fullNamePerSe isEmptyOrNil

repository/Seaside-Pharo-Welcome.package/GRPharoPlatform.extension/instance/seasideIsAuthorNameSet.st

@@ -1,3 +1,5 @@
 *seaside-pharo-welcome
 seasideIsAuthorNameSet
-	^ Author fullNamePerSe isEmptyOrNil not
+
+	SystemVersion current major >= 13 ifTrue:[ ^ true. "Author does not exist anymore" ].
+	^ (Smalltalk at: #Author) fullNamePerSe isEmptyOrNil not

repository/Seaside-Pharo-Welcome.package/GRPharoPlatform.extension/instance/seasideSetAuthorName..st

@@ -1,3 +1,5 @@
 *seaside-pharo-welcome
 seasideSetAuthorName: anAuthorName
-	Author fullName: anAuthorName
+
+	SystemVersion current major >= 13 ifTrue:[ ^ self error: 'Author does not exist anymore.' ].
+	(Smalltalk at: #Author) fullName: anAuthorName