Kamala Harris LIES to entire audience, says 'I have sued Exxon Mobile' - but she never did

Kamala Harris said in person, in front of an audience, "I have sued Exxon Mobile" but then fact checkers did research and proved she is LYING. According to Politifact, there is NO evidence that Kamala Harris has ever filed a lawsuit against Exxon Mobile.
From the fact checkers themselves:
We found Harris’ office investigated Exxon in 2016 over allegations it lied to the public and its shareholders about the risk to its business from climate change. The Los Angeles Times detailed that probe in a January 2016 news article. It said Exxon rejected the allegations. 

But there’s no public record, and nothing that Harris’ campaign could provide, to show she filed a lawsuit against the company.