The visa officer is looking for proof that your relationship is genuine. Having relatives at your wedding shows that the families support the marriage and know about it, hallmarks of a genuine relationship. The visa officer will question why parents and other relatives are not there. But this does not mean they will refuse a visa because of this. Lots of people get married without their parents there, and are still issued a PR visa.
All you have to do is explain why your parents couldn't come to the wedding. Also show any proof of the reason that you have. If you also can get evidence that your parents like your husband and approve of the marriage, include that as well. For example, your mother could write a letter explaining why she and your father couldn't come to the wedding, but that they have met your husband, like him a lot, and support the marriage fully.
If they don't support the marriage, just explain they couldn't come. If you have lots of evidence of a genuine relationship, it won't matter.