The average Californian owes less in credit card and mortgage debt than they did last year, according to a new report, but credit scores still dropped a little. According a monthly report from Credit Karma, Californians owed $303,745 in mortgage debt in April, compared to $309,579 in March and $311,551 in April 2011. Californians also owed an average $5,674 in credit card debt, compared to $5,900 in March and $6,384 in the year earlier period. Student loan debt fell to $29,069, but auto debt rose...