Error 500 when editing a Wiki page that does not exist
https://sentry.gitlab.net/gitlab/gitlabcom/issues/561605/
NoMethodError: undefined method `content' for nil:NilClass
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projects/wikis_controller.rb:153:in `block in valid_encoding?'
@page.content.encoding == Encoding::UTF_8
gitlab/utils/strong_memoize.rb:26:in `strong_memoize'
instance_variable_set(ivar(name), yield)
projects/wikis_controller.rb:152:in `valid_encoding?'
strong_memoize(:valid_encoding) do
active_support/callbacks.rb:432:in `block in make_lambda'
lambda { |target, _, &blk| target.send filter, &blk }
active_support/callbacks.rb:417:in `block in invert_lambda'
lambda { |*args, &blk| !l.call(*args, &blk) }
...
(132 additional frame(s) were not displayed)
NoMethodError: undefined method `content' for nil:NilClass
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