nagios: Don’t crash on missing cron file.
nagios: Don’t crash on missing cron file.

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulip.com>

zulip/zulip,andersk/zulip,timabbott/zulip,rht/zulip,zulip/zulip,andersk/zulip,andersk/zulip,brainwane/zulip,punchagan/zulip,hackerkid/zulip,timabbott/zulip,hackerkid/zulip,andersk/zulip,kou/zulip,punchagan/zulip,zulip/zulip,brainwane/zulip,kou/zulip,brainwane/zulip,zulip/zulip,shubhamdhama/zulip,showell/zulip,showell/zulip,andersk/zulip,hackerkid/zulip,punchagan/zulip,showell/zulip,eeshangarg/zulip,synicalsyntax/zulip,rht/zulip,brainwane/zulip,zulip/zulip,synicalsyntax/zulip,eeshangarg/zulip,punchagan/zulip,rht/zulip,synicalsyntax/zulip,kou/zulip,timabbott/zulip,synicalsyntax/zulip,kou/zulip,brainwane/zulip,rht/zulip,punchagan/zulip,eeshangarg/zulip,rht/zulip,timabbott/zulip,brainwane/zulip,punchagan/zulip,showell/zulip,showell/zulip,shubhamdhama/zulip,shubhamdhama/zulip,kou/zulip,kou/zulip,shubhamdhama/zulip,hackerkid/zulip,timabbott/zulip,timabbott/zulip,punchagan/zulip,rht/zulip,rht/zulip,kou/zulip,hackerkid/zulip,eeshangarg/zulip,brainwane/zulip,andersk/zulip,eeshangarg/zulip,zulip/zulip,eeshangarg/zulip,shubhamdhama/zulip,showell/zulip,shubhamdhama/zulip,shubhamdhama/zulip,hackerkid/zulip,hackerkid/zulip,synicalsyntax/zulip,andersk/zulip,timabbott/zulip,synicalsyntax/zulip,synicalsyntax/zulip,showell/zulip,eeshangarg/zulip,zulip/zulip