In that case I can't imagine this being a problem, especially if this was for a legitimate reason beyond your control.
My situation differed from yours in that I took a LOA during undergrad. It resulted in 3 W's, and I was always given the opportunity to explain the circumstances that led to what admissions saw on my transcripts. I also included an explanation in the supplemental applications, if possible.
I think you would only come across some difficulty if it happened more than once, assuming your grades look good otherwise.