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[bugfix] VariableSizeCommunicator fixes

Markus Blatt requested to merge bugfix/variablesizecommunicator-fixes into master

Fixed various bugs encountered when scattering variable size data from one master process.

  • Bogus assertion that we actually packed data (which might not be the case here)
  • Trying to test more send/recv requests than are active (raised MPI Error: Invalid MPI_REQUEST)

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