[FIX] sap.m.MultiInput - fix issue that string disappears if no matched
suggestion item is found

Change-Id: I35c3b149bf85c57b954ff124a89c4b0a197b2b11
BCP: 1482011295
(cherry picked from commit af695b37d1f1021f2e36533967f7cbbdd4de3890)
CR-Id: 012003146900008937092014
Merge "[FIX] sap.m.MultiInput - fix issue that string disappears if no matched suggestion item is found" into rel-1.26