use empty Result list get redistributed prev_results

[mjlong]

Description

when distributing previous results for MPI, the empty results to load distributed previous results were constructed inappropriately.
Currently, the supposed to be empty results read results from "depletion_results.h5" in the current directory.
This leads to errors of file not found if previous results are not stored "depletion_results.h5" in the current directory.
It also makes the output "depletion_results.h5" mingled with results from "depletion_results.h5" in the current directory, instead of the previous results passed in constructing the transport operator.

Fixes #2878

Checklist

• I have performed a self-review of my own code
• I have run clang-format (version 15) on any C++ source files (if applicable)
• I have followed the style guidelines for Python source files (if applicable)
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)

[church89]

Hi @mjlong , I've already noticed the same thing and opened this PR a few weeks ago ;)

[paulromano]

Closing as this is a duplicate of #2778