Most of the musicians I've ever played with have had less than stellar credit, often awful. My credit isn't pretty, either. I never ask about it up front, but it usually comes up on its own in conversations about personal responsibility and accountability. Ultimately, there has been no correlation whatsoever between their credit score and their musicianship, in my experience.
Employment, living arrangements, and their philosophies on playing music told me almost everything I needed to know that their chops could not.
In at least two instances, so did their significant others. I once fired a keyboardist because his wife was an absolute horror to deal with on tour, and it killed his focus at the gig. I had only met her twice before that tour, and she was chock full of red flags, but we had a policy of not judging our bandmates by the people they dated or were married to. After that tour, we seriously reconsidered that policy.