DecompWriter crashes

[FG-TUM]

Describe the bug
Activating the debug writer causes a crash in DomainDecompMPIBase::printDecomp() at the call to MPI_File_open().
For me, this only happens when compiling without AutoPas.

To Reproduce

1. Compile with default settings (MPI, no AutoPas)
2. Run e.g. the Argon scenario and add the XML for the decomp writer:

<outputplugin name="DecompWriter">
        <writefrequency>100</writefrequency>
</outputplugin>

3. Run with >1 mpi ranks
4. See error

Expected behavior
No error.

Build environment (please complete the following information):

• OS: Linux
• Compiler: mpicc (GCC 7.5)
• Build System: cmake / make