Fix undefined method 'dump' for nil:NilClass (NoMethodError) #1475
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As stated in this PR #782 and HTTP RFC https://tools.ietf.org/html/rfc1945#section-6.1 reason phrase is optional in status line, thus
@message
variable can be nil anderror!
method can throw error because we try to calldump
on nil. I think we can simply avoid this just checking it straightforward.