This bug report is for Squeak 3.7 alpha # 5763

When you try to open a protocol browser from
a class browser, you get a walkback.

To see the bug, do this:

1. In a Morphic project, open a browser
and select a class

2. bring up the menu of the class names field
and select "browse protocol".

You will see a notifier
"Message not Understood: UndefinedObject>>at:ifAbsent:

I think that the bug is a very simple one: In
MessageSet>>selection  we do not check for an
undefined value. The attached change set is a proposal
to fix it. 

It would be nice to include a fix into 3.7.

Greetings, Boris


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