Interpreter crashes when given non-existent file in interactive mode #919

bpython % python3 -i file_that_does_not_exist.py
/Library/Developer/CommandLineTools/usr/bin/python3: can't open file 'file_that_does_not_exist.py': [Errno 2] No such file or directory
>>> ^D


bpython % bpython -i file_that_does_not_exist.py
Traceback (most recent call last):
  File "/Users/arian/Library/Python/3.8/bin/bpython", line 8, in <module>
    sys.exit(main())
  File "/Users/arian/Library/Python/3.8/lib/python/site-packages/bpython/curtsies.py", line 181, in main
    bpargs.exec_code(interp, exec_args)
  File "/Users/arian/Library/Python/3.8/lib/python/site-packages/bpython/args.py", line 161, in exec_code
    with open(args[0]) as sourcefile:
FileNotFoundError: [Errno 2] No such file or directory: 'file_that_does_not_exist.py'
bpython %