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As discussed in #249, the default behavior for AMD was changed with pull request #226 and as a result, CPUs that do not have microcode patches (because they're up to date) were leading to NRM_UNKNOWN resulting in "Failed to check for processor microcode upgrades." which is inaccurate.
This sets the $vars{AVAIL} to 0 if there are microcode patches to scan and none apply. While this doesn't guarantee microcode is up to date or from a valid source, it restores the previous behavior while accounting for the edge case presented in the previous pull request.