[Trigger CI ]Fix regression in synthetic target context handling. #1260
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This fixes an issue I ran into testing the changes I introduced on friday. The problem was that if you set derived_from to None, when applying the synthetic targets by their derived targets, the derived target would be None, so it would raise an error on the logging line I added. I removed the log line, since after thinking about it, I don't think it's necessary. Also I guarded adding targets to the synthetic target dict because if derived_from is None, then it won't be used, so there's no point in adding it.