debugger: fix debugging of examples

[LinqLover]

Previously, invocating the action #debug on an SBExample failed because SBSmallError did not understand #focus.

[coveralls]

Pull Request Test Coverage Report for Build 1938386413

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Totals
Change from base Build 1922503786:	0.0%
Covered Lines:	0
Relevant Lines:	0

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💛 - Coveralls