Add comments to empty blocks to address Sonar csharpsquid:S108, #672

[paulirwin]

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Add comments to empty blocks to address Sonar csharpsquid:S108

Fixes #672

Description

Sonar was finding empty blocks (while, using, for, catch, etc.) that did not have any statements in them nor comments, so this adds comments since in almost all cases it was intended to be ignored. In one case, the code was changed to better match upstream by manually calling Dispose instead of using a using block.