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This should prevent a JS error message when the user's OS is missing the lsb_release CLI tool. The OS description string in the about dialog then becomes "unknown (probably missing lsb_release)". It seemed a bit silly to me to spam a JS error and break the about dialog entirely when a CLI tool that apparently doesn't exist by default on many distros in fact doesn't exist.
Tested only on my local OpenSUSE 15.0 machine, with and without the lsb-release installed.
I'm not a JS developer at all, so let me know if I did something silly, or edit it however. In case it matters (since there doesn't seem to be a CLA), feel free to use, (re)license, or ignore the contents of this PR however you want now or in the future.