[ET Trac] [Einstein Toolkit] #1631: The dgfe branch for McLachlan generates NaNs

[Einstein Toolkit]

#1631: The dgfe branch for McLachlan generates NaNs
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 Reporter:  Jonah Miller <jonah.maxwell.miller@…>          |       Owner:  eschnett           
     Type:  defect                                         |      Status:  new                
 Priority:  optional                                       |   Milestone:  ET_2014_11         
Component:  EinsteinToolkit thorn                          |     Version:  development version
 Keywords:  dgfe,mclachlan,gamma driver                    |  
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 When one uses the gamma driver formulation in the dgfe branch of McLachlan
 and sets the shiftGammaCoefficient to zero, the runtime output has NaNs
 because the code divides by zero.

 A bit of flow control fixes this. Attached is a patch for the branch.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1631>
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