Fixes the no results cell in Stats from being cut off when > 2 lines

The Stats view had a cell that would display when there were no
results for that particular day. The problem was this cell had a
static row height which resulted in any text greater than 2 lines
not rendering completely.
Merge pull request #1341 from wordpress-mobile/issue/1338-fix-no-result-message-cut-off

Fix no result message cut off