Adjust execution of server code to generate better error messages

[Bluesy1]

Before (Non SyntaxError):

$ checkq ../instructor_stats_bank/source/unsorted/openstax_C2_Q12_to_Q17/openstax_C2_Q12_to_Q17.md
Processing question: ../instructor_stats_bank/source/unsorted/openstax_C2_Q12_to_Q17/openstax_C2_Q12_to_Q17.md
There is an error in this problem: 
        - File path: ../instructor_stats_bank/source/unsorted/openstax_C2_Q12_to_Q17/openstax_C2_Q12_to_Q17.md
        - Error: can only concatenate str (not "list") to str
Traceback (most recent call last):
  File "/home/gavin/OPB/problem_bank_scripts/.venv/bin/checkq", line 6, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/gavin/OPB/problem_bank_scripts/src/problem_bank_scripts/scripts/check_question.py", line 51, in main
    raise e
  File "/home/gavin/OPB/problem_bank_scripts/src/problem_bank_scripts/scripts/check_question.py", line 42, in main
    process_question_pl(question.as_posix(), output_path=output_dir)
  File "/home/gavin/OPB/problem_bank_scripts/src/problem_bank_scripts/problem_bank_scripts.py", line 1367, in process_question_pl
    server.generate(data2)
  File "<string>", line 40, in generate
TypeError: can only concatenate str (not "list") to str

After (Non SyntaxError):

$ checkq ../instructor_stats_bank/source/unsorted/openstax_C2_Q12_to_Q17/openstax_C2_Q12_to_Q17.md
Processing question: ../instructor_stats_bank/source/unsorted/openstax_C2_Q12_to_Q17/openstax_C2_Q12_to_Q17.md
There is an error in this problem: 
        - File path: ../instructor_stats_bank/source/unsorted/openstax_C2_Q12_to_Q17/openstax_C2_Q12_to_Q17.md
        - Error: Error in running the server code, please review the below traceback: 

Traceback (most recent call last):
  File "/home/gavin/OPB/problem_bank_scripts/src/problem_bank_scripts/problem_bank_scripts.py", line 1378, in process_question_pl
    server["generate"](data2)
  File "/tmp/tmpuup_d_w2_openstax_C2_Q12_to_Q17/server.py", line 40, in generate
    table = "test" + [
            ^^^^^^^^^^
TypeError: can only concatenate str (not "list") to str

Before (SyntaxError):

$ checkq ../instructor_stats_bank/source/unsorted/openstax_C2_Q12_to_Q17/openstax_C2_Q12_to_Q17.md
Processing question: ../instructor_stats_bank/source/unsorted/openstax_C2_Q12_to_Q17/openstax_C2_Q12_to_Q17.md
There is an error in this problem: 
        - File path: ../instructor_stats_bank/source/unsorted/openstax_C2_Q12_to_Q17/openstax_C2_Q12_to_Q17.md
        - Error: invalid syntax (<string>, line 40)
Traceback (most recent call last):
  File "/home/gavin/OPB/problem_bank_scripts/.venv/bin/checkq", line 6, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/gavin/OPB/problem_bank_scripts/src/problem_bank_scripts/scripts/check_question.py", line 51, in main
    raise e
  File "/home/gavin/OPB/problem_bank_scripts/src/problem_bank_scripts/scripts/check_question.py", line 42, in main
    process_question_pl(question.as_posix(), output_path=output_dir)
  File "/home/gavin/OPB/problem_bank_scripts/src/problem_bank_scripts/problem_bank_scripts.py", line 1363, in process_question_pl
    exec(server_py, server.__dict__)
  File "<string>", line 40
    table === [
            ^
SyntaxError: invalid syntax

After (SyntaxError):

$ checkq ../instructor_stats_bank/source/unsorted/openstax_C2_Q12_to_Q17/openstax_C2_Q12_to_Q17.md
Processing question: ../instructor_stats_bank/source/unsorted/openstax_C2_Q12_to_Q17/openstax_C2_Q12_to_Q17.md
There is an error in this problem: 
        - File path: ../instructor_stats_bank/source/unsorted/openstax_C2_Q12_to_Q17/openstax_C2_Q12_to_Q17.md
        - Error: Error in running the server code, please review the below traceback: 

Traceback (most recent call last):
  File "/home/gavin/OPB/problem_bank_scripts/src/problem_bank_scripts/problem_bank_scripts.py", line 1376, in process_question_pl
    code = compile(server_py, file.as_posix(), "exec")
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/tmppkx22blx_openstax_C2_Q12_to_Q17/server.py", line 40
    table === [
            ^
SyntaxError: invalid syntax