Fix no implicit conversion error

Kentaro Hayashirequested to merge
kenhys/how-can-i-help:fix-implicit-conversion into master

It fixes the following error:

/usr/bin/how-can-i-help:238:in &': no implicit conversion of nil into Array (TypeError) from /usr/bin/how-can-i-help:238:in block in ' from /usr/bin/how-can-i-help:215:in each' from /usr/bin/how-can-i-help:215:in '

ref. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1087362

The above error was raised when there was a case that hi['packages'] was nil.

e.g.

{"type"=>"testing-autorm", "hash"=>"0eb6b1e5e7f22c5d6211adb3e29791d6", "source"=>"dhcpcanon", "packages"=>nil, "removal_time"=>1732643103, "bugs"=>["1084132"]}

hcpcanon was already removed from unstable and testing, and also stable. It seems irregular case.

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