Parser issues

[Caruychen]

Some early preliminary findings for better error handling in the parser

• Parser accepts edge and room inputs with comments mid-line
• Map with empty lines between inputs prints all the prior rooms/links before the error message. Should only print the error message instead.
• Two commands in sequence of the same line are not addressed (e.g. ##end followed immediately by ##start.)
• Currently prints any lines preceding an invalid line..

[Caruychen]

New issue, when no ##end is provided, doesn't print error