Update article.md

Added 'Oxford comma" (comma before 'and' at the end of a list). Not all consider it necessary, but I think it improves readability.
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# Error handling, "try..catch"
No matter how great we are at programming, sometimes our scripts have errors. They may occur because of our mistakes, an unexpected user input, an erroneous server response and for a thousand other reasons.
No matter how great we are at programming, sometimes our scripts have errors. They may occur because of our mistakes, an unexpected user input, an erroneous server response, and for a thousand other reasons.
Usually, a script "dies" (immediately stops) in case of an error, printing it to console.