Ghost cell generator crashes with SIGSEGV in Wavelet -> Threshold -> Aggregate Data -> Generate Ghost Cells pipeline

@yohann.bearzi @cory.quammen @utkarsh.ayachit @patchett2002

Local linux client from here

Server is intel, openmpi, osmesa build with spack of ParaView @ 686e45ea

The server crashed on Apply of the ghost cell generator after this pipeline with Loguru caught a signal: SIGSEGV

To reproduce:

1. Default wavelet source (36 MPI ranks)
2. Threshold filter (capture everything)
3. Aggregate Dataset filter (Down to 8 MPI ranks)
4. Default Generate Ghost Cells filter -> Apply

Stack trace:

Stack trace:
26            0x403589 /yellow/usr/projects/paraview/pilotlight/tmp_snow_master_intel_19.0.4.243/spack/opt/spack/linux-rhel7-broadwell/intel-19.0.4.243/paraview-master-2ryfgurki4x53k4cdbmnehmtt7repmgi/bin/pvserver() [0x403589]
25      0x2b1ace8c8555 __libc_start_main + 245
24            0x403828 /yellow/usr/projects/paraview/pilotlight/tmp_snow_master_intel_19.0.4.243/spack/opt/spack/linux-rhel7-broadwell/intel-19.0.4.243/paraview-master-2ryfgurki4x53k4cdbmnehmtt7repmgi/bin/pvserver() [0x403828]
23      0x2b1ac5f86711 vtkMultiProcessController::ProcessRMIs(int, int) + 657
22      0x2b1ac5f86fb4 vtkMultiProcessController::BroadcastProcessRMIs(int, int) + 164
21      0x2b1ac5f86d33 vtkMultiProcessController::ProcessRMI(int, void*, int, int) + 963
20      0x2b1ac4eb8f9a vtkPVSessionCore::ExecuteStreamSatelliteCallback() + 170
19      0x2b1ac4eb8417 vtkPVSessionCore::ExecuteStreamInternal(vtkClientServerStream const&, bool) + 167
18      0x2b1ac4391309 vtkClientServerInterpreter::ProcessStream(vtkClientServerStream const&) + 41
17      0x2b1ac438dc72 vtkClientServerInterpreter::ProcessOneMessage(vtkClientServerStream const&, int) + 1922
16      0x2b1ac438fd5d vtkClientServerInterpreter::ProcessCommandInvoke(vtkClientServerStream const&, int) + 301
15      0x2b1ac4391697 vtkClientServerInterpreter::CallCommandFunction(char const*, vtkObjectBase*, char const*, vtkClientServerStream const&, vtkClientServerStream&) + 855
14      0x2b1ac21997fc vtkSISourceProxyCommand(vtkClientServerInterpreter*, vtkObjectBase*, char const*, vtkClientServerStream const&, vtkClientServerStream&, void*) + 1772
13      0x2b1ac4efcdc6 vtkSISourceProxy::UpdatePipeline(int, double, bool) + 326
12      0x2b1aca472bd5 vtkStreamingDemandDrivenPipeline::Update(int, vtkInformationVector*) + 261
11      0x2b1aca408acf vtkDemandDrivenPipeline::UpdateData(int) + 143
10      0x2b1aca4726d1 vtkStreamingDemandDrivenPipeline::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 1809
9       0x2b1aca4078fc vtkDemandDrivenPipeline::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 252
8       0x2b1aca402c3a vtkCompositeDataPipeline::ForwardUpstream(vtkInformation*) + 314
7       0x2b1aca4726d1 vtkStreamingDemandDrivenPipeline::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 1809
6       0x2b1aca4079aa vtkDemandDrivenPipeline::ProcessRequest(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 426
5       0x2b1aca403240 vtkCompositeDataPipeline::ExecuteData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 64
4       0x2b1aca408e59 vtkDemandDrivenPipeline::ExecuteData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 57
3       0x2b1aca40cc7d vtkExecutive::CallAlgorithm(vtkInformation*, int, vtkInformationVector**, vtkInformationVector*) + 61
2       0x2b1ac5d09494 vtkGhostCellsGenerator::RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) + 3156
1       0x2b1ac5d12434 int vtkDIYGhostUtilities::GenerateGhostCells<vtkUnstructuredGrid>(std::vector<vtkUnstructuredGrid*>&, std::vector<vtkUnstructuredGrid*>&, int, vtkMultiProcessController*) + 2100
0       0x2b1ac5d82c6c vtkDIYGhostUtilities::SetupBlockSelfInformation(vtkdiy2::Master&, std::vector<vtkUnstructuredGrid*>&) + 1084