Commit ed778303 authored by Jehan's avatar Jehan

app: only show a "Last checked" date when we did at least 1 check.

If for instance you've got no internet connection or other reasons that
a check might fail, the check-update-timestamp will be 0, which is
1970-01-01.
Thanks to Alexandre Prokoudine for noticing it!
parent 49588963
Pipeline #151196 passed with stages
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