mumukit skips expectations when content is interpolated into extra

[julian-berbel]

Here we skip running expectations when request content is empty:

mumukit/lib/mumukit/server/test_server.rb

Line 109 in 6559512

request.expectations.nil? || (request.content.nil? && !Mumukit.config.process_expectations_on_empty_content)

But this causes conflicts with requests where content is interpolated into the extra. A request like the following:

content:

def foo
  puts 'printing to console!'
end

extra:

class Bar
#...content...#
end

will come back with no smells as extra "swallows" content, which leaves it empty for the aforementioned check.

Maybe we could run these checks before interpolations?