Prevent transient error messages where no temperature is provided

[rrobgill]

What does this PR aim to accomplish?:

Prevent transient error messages on refresh where hardware temperature is not reported under v6.

How does this PR accomplish the above?:

Avoids attempts to calculate from a null value. Existing mechanism to indicate unknown units is used.

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[yubiuser]

Thanks for your PR:

Could you also please change L435/437 to show N/A . I think showing °? in case no data is returned at all is not the best solution.

[rrobgill]

Could you also please change L435/437 to show N/A . I think showing °? in case no data is returned at all is not the best solution.

Changing it to N/A required further adjustment.

The spacings originally present are assuming the presence of a multibyte unicode ° symbol. As printf's padding counts bytes, not characters (https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap05.html#tag_05) this throws the column alignment off if there is no degree symbol.

It turns out this was also effecting the spacing if the units were set to Kelvins.

[yubiuser]

Thanks for being that precise. I'd like to group similar things together, please put all the padding calculation into GenerateSizeDependendOutput()

[yubiuser]

I think Kelvin need some padding as well. See how 'CPU load' moved to the right

[rrobgill]

It now clears the flags explicitly, so won't misalign if units change on the fly.

[yubiuser]

Perfect!

Could you please squash it down to 1 or 2 commits and rebase on latest development?

[github-actions]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[github-actions]

Conflicts have been resolved.