null value for "User Numeric ID" causes Rainbow Grades to crash

[bmcutler]

Describe the bug
Reported by instructor:

My "User Numeric ID" was set to null instead of an empty string ""
This caused a failure in the parser in ./process_grades.out
Manually setting my ID to an empty string in Submitty fixed the issue
Specifically, what I was seeing when running make is below:

./process_grades.out by_overall
terminate called after throwing an instance of 'nlohmann::detail::type_error'
  what():  [json.exception.type_error.302] type must be string, but is null
make: *** [../RainbowGrades/MakefileHelper:108: overall] Aborted (core dumped)

[tanwar-abhi]

Was this issue observed for existing user or for a new user?
Can you please describe a little about how to recreate this issue?

[Junaidm678]

i want to work on this please asign me

[anupkewat]

I could help with this issue. Please assign it to me.