Jun Pataleta d45f0f0ceb MDL-64958 grade_import: Ensure correct user is being fetched
* We need to ensure that we are checking the correct user account.
  Since email and idnumber are not unique fields, there's a chance that
  multiple user records will match when querying for user data using
  these fields. This might lead to a different user's grades being
  inadvertently modified during grade import. In such a case, this
  function needs to return a null userid.
2019-03-11 09:32:17 +08:00
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