Revisit coverage, update to 100% code/branch or write issues where unreachable

[skliper]

Failure: Coverage lc lines 99.6% functions 100.0% branches 94.3%

Other coverage failures:
Failure: Coverage cs lines 99.9% functions 100.0% branches 99.1%
Failure: Coverage ds lines 99.6% functions 100.0% branches 97.7%
Failure: Coverage fm lines 93.8% functions 94.0% branches 89.1%
Failure: Coverage hs lines 100.0% functions 100.0% branches 98.1%
Failure: Coverage md lines 98.4% functions 100.0% branches 96.7%
Failure: Coverage sc lines 99.9% functions 100.0% branches 99.0%

Fix where possible, elsewise Issues should document all uncovered lines/branches and disposition (why it's ok as-is)

Imported from GSFCCFS-1935