#11 Code refactoring on class ClientGUI (revision.v1)

[Nicolas Rocca]

New code refactoring that was left behind on the first revision, on the ClientGUI class:

• Add default case in switch statement: on line 417 add a default case to match the enum constant ERROR
• Replace hard-code line separators: replace line separator “\n” for System.getProperty("line.separator"), on lines 364 and 372, is more accurate to use this because the hard-code “\n” separator is platform dependent

[Nicolas Rocca]

Code changes applied