Added and tested functionality for 'N/A' stats calculation. #3895
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Added and tested functionality for including "N/A" in stats output.
Description
In situations in which there are no valid pixels, stats output skipped a variety of stats types. This led to problems in the alignment of columns when output was combined with images that contained valid pixels.
Related Issue
#3870
Motivation and Context
This allows for columns to be populated with "N/A" in situations in which an image contains only special pixels.
How Has This Been Tested?
Functionality was manually tested on the data included in #3870 issue description. Additionally, "stats" ctests were updated
Types of changes
Checklist:
Licensing
This project is mostly composed of free and unencumbered software released into the public domain, and we are unlikely to accept contributions that are not also released into the public domain. Somewhere near the top of each file should have these words: