fixed 5pm requests issue solved, point a to a issue solved

m-f departure requests at 5pm can have des results of 6
and t_diff doesn't know that the cruiser stops at 5:30 and hence allows
it
as a legit result so i made sure that past 6pm results given current
hour 5pm will not count as valid.  also fixed the issue of null/null
(start/finish values getting through filtering process for m/t/w past
midnight queries(these don't seem to introduce significant errors -only
if your start/stop is the same and the cruiser does the round in exactly
1 hr then the results will be wrong- a rare case and hence hard to see.
anyhow now that is solved since null/null values will not pass logic
fixed on line 359