frontend: Remove unnecessary try / catch
frontend: Remove unnecessary try / catch

This try / catch looks unnecessary and has the wrong error message
anyway.

justaugustus/tectonic-installer,alexsomesan/tectonic-installer,hhoover/tectonic-installer,hhoover/tectonic-installer,squat/tectonic-installer,zbwright/tectonic-installer,kyoto/tectonic-installer,metral/tectonic-installer,lander2k2/tectonic-installer,zbwright/tectonic-installer,alexsomesan/tectonic-installer,kyoto/tectonic-installer,mrwacky42/tectonic-installer,cpanato/tectonic-installer,squat/tectonic-installer,hhoover/tectonic-installer,cpanato/tectonic-installer,kyoto/tectonic-installer,lander2k2/tectonic-installer,kalmog/tectonic-installer,zbwright/tectonic-installer,alexsomesan/tectonic-installer,mrwacky42/tectonic-installer,mrwacky42/tectonic-installer,kalmog/tectonic-installer,justaugustus/tectonic-installer,alexsomesan/tectonic-installer,mrwacky42/tectonic-installer,justaugustus/tectonic-installer,metral/tectonic-installer,metral/tectonic-installer,lander2k2/tectonic-installer,hhoover/tectonic-installer,squat/tectonic-installer,lander2k2/tectonic-installer,derekhiggins/installer,mrwacky42/tectonic-installer,justaugustus/tectonic-installer,hhoover/tectonic-installer,zbwright/tectonic-installer,cpanato/tectonic-installer,kyoto/tectonic-installer,zbwright/tectonic-installer,kalmog/tectonic-installer,kyoto/tectonic-installer,alexsomesan/tectonic-installer,derekhiggins/installer,squat/tectonic-installer,metral/tectonic-installer,justaugustus/tectonic-installer,metral/tectonic-installer,cpanato/tectonic-installer