Further registerOutputs cleanups
          #14286
        
          
      
                
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Motivation
This does some more simplifications/improvements after #14280 fixed the bug.
The first commit is no behavior change, and just simplifies the control flow.
The second commit I believes improves behavior by ensuring that we also call
optimisePathin the repair case, while still not unnecessarily doing it in the already-built case.Context
#14280
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