If the text area for the contents is left empty, PRPage>>contents:
receives a nil object and fails to parse it as a document.
The reason is that the parser can only interpret string objects and
not nil objects.
PRDocumentParser parse: nil.
The solution could be to assign an empty PRDocument if the value of
aString is an nil object.
PRPage>>contents: aString
aString
ifNil: [ self document: PRDocument new ]
ifNotNil: [ self document: (self parserClass parse: aString) ].
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