MAP: Bug fixes on Map Profile.

Added following bug fixes:

1) Optimize GET MessagesListing operation
Modify sqlite database query to fetch only 'MaxListCount'
elements starting from 'ListStartOffset' instead of
fetching the complete database and filter out,
when these parameters are specified in the GET
MessagesListing Request.

2) Change to set empty sender addressing in message listing
element if it is null.

3) set empty sender name in message lsiting element if null.

Change-Id: I27ba852628e0455905dcd6d37ee045da6b5afc77
CRs-fixed: 785977