You should be able to control this by choosing how null values are shown - break the line, or move to zero. Can't seem to find out how to do this in 7 though..
Thanks for the suggestion, I've tried those in different ways:
Analysis menu -> Special Values -> Show (doesn't do anything on Continuous date view)
Format sidebar->Fields dropdown-> [field] -> Pane tab -> Special Values -> Text or Marks (none of the settings work on the Continuous date view)
I've also tried variations with Path shelf as well, nothing seems to change the discrete vs. continuous.
Here's another test.
Dear Jonathan Sir,
Did you able to solve the issue as I am also facing the same Issue. it would be great if you can have a look and provide me the some useful work around. I am able to solve the issue with Discrete Hour Field but facing problem with continuous Field.