Any of the following circumstances shall constitute fraud referred to in number 4 of the preceding article:
(1) Misrepresentation as to the identity of one of the contracting parties;
(2) Non-disclosure of the previous conviction of the other party of a crime involving moral turpitude, and the penalty imposed was imprisonment for two years or more;
(3) Concealment by the wife of the fact that at the time of the marriage, she was pregnant by a man other than her husband.
No other misrepresentation or deceit as to character, rank, fortune or chastity shall constitute such fraud as will give grounds for action for the annulment of marriage. (n)