GF-58362: Set scroll threshold when page 2 doesn't have any controls.

When DataGrilList has very small data set, page2 does not have any
controls. In this case, threshold lowerProp is meaningless.

Enyo-DCO-1.1-Signed-off-by: David Um david.um@lge.com
Merge pull request #630 from DavidUM/GF-58362-davidum

Gf 58362 Scroll threshold has invalidate bounds when list has very small data set.

LGTM

Signed-off-by: Cole Davis (cole.davis@lge.com)