Totoro: new method to calculate plateCompletion for exposures with nan
Totoro: new method to calculate plateCompletion for exposures with nan

git-svn-id: 4cc190fc39e9820a559d36ddf8afa2c6b4452b05@64669 acfa968b-e9c4-4993-a9e6-846a59bbf143

albireox/Totoro,ApachePointObservatory/Totoro