Create a function that turns a list of words into a comma separated list, where the last word is separated by the word "and".
words_to_sentence(["innokodakademija"]) ➞ "innokodakademija"
words_to_sentence(["Hello", "", "Bye"]) ➞ "Hello and Bye"
words_to_sentence(["Hello", "Bye", "See you soon"]) ➞ "Hello, Bye and See you soon"
None values, empty lists or lists with only empty or None values should return an empty string: ""