Use coalesce to check if total_xp = nil

lib/cadet/assessments/assessments.ex

@@ -1465,7 +1465,7 @@ defmodule Cadet.Assessments do
  ans_xp
  |> subquery
  |> select([a], %{
- total_xp: sum(a.total_xp)
+ total_xp: coalesce(sum(a.total_xp), 0)
  })
  |> Repo.one()
 
@@ -1476,15 +1476,8 @@ defmodule Cadet.Assessments do
  submission.submitted_at
  end
 
- xp =
- if is_integer(total.total_xp) do
- total.total_xp
- else
- decimal_to_integer(total.total_xp)
- end
-
  xp_bonus =
- if xp <= 0 do
+ if total.total_xp <= 0 do
  0
  else
  if Timex.before?(cur_time, Timex.shift(assessment.open_at, hours: early_hours)) do