df still prints valid filesystems when a mount point cannot be queried (for example a stale FUSE mount), but exits non-zero. The dashboard and the disk alert discarded the whole output in that case, so no disk was displayed. Keep using the output whenever it is not empty. Refs #13864.
#### What this PR does / why we need it?
Refs https://github.com/1Panel-dev/1Panel/issues/12681
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#### What this PR does / why we need it?
Refs https://github.com/1Panel-dev/1Panel/issues/12488
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Refs https://github.com/1Panel-dev/1Panel/issues/12482
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#### What this PR does / why we need it?
Refs https://github.com/1Panel-dev/1Panel/issues/7759
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