STLWriter complains when writing empty datasets

To replicate, do the following:

Linux, master (v5.6.1-1795-g31909750), remote server. Use 16 ranks.
Load g1s1. Apply.
Extract Surface. Apply.
File/ Save Data. .stl. OK.
Number of I/O Ranks - 4. OK.

We get the following errors:

ERROR: In /snip/src/VTK/IO/Geometry/vtkSTLWriter.cxx, line 76 vtkSTLWriter (0x3f8f950): No data to write!

ERROR: In /snip/src/VTK/IO/Geometry/vtkSTLWriter.cxx, line 76 vtkSTLWriter (0x3f8f950): No data to write!

Edited Jan 23, 2020 by W. Alan Scott

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