Fix: handle no students in class in deposit

lib/confient_web/controllers/deposit_controller.ex

@@ -20,7 +20,7 @@ defmodule ConfientWeb.DepositController do
       {:ok, class} ->
         next_assignments = Confient.Works.get_next_assignments(class)
 
-        if length(next_assignments) > 0 && length(class.students) do
+        if length(next_assignments) > 0 && length(class.students) > 0 do
           changeset = Confient.Student.Work.changeset(%Confient.Student.Work{}, %{})
 
           student =