[ET Trac] [Einstein Toolkit] #2179: NaNChecker: fix output of NaNMask

[Einstein Toolkit]

#2179: NaNChecker: fix output of NaNMask
---------------------------------+-----------------------------------
 Reporter:  Roland Haas          |       Type:  defect
   Status:  new                  |   Priority:  minor
Milestone:                       |  Component:  EinsteinToolkit thorn
  Version:  development version  |   Keywords:  NaNChecker
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 In af45e31 - NaNChecker: reduce nan mask in level mode a bug was
 introduced that caused the NaNMask to be cleared in level mode where the
 NaNMask pointer is not valid.

 This fixes this and also restructures the functions so that all levels of
 the NaNMask starting with the one containing NaNs are output.

 Pull request is here:

 https://bitbucket.org/cactuscode/cactusutils/pull-requests/15/nanchecker-
 fix-output-of-nanmask/diff

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/2179>
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