[FIX] AnalyticalTable: Event Handlers for contextChange were registered
twice

Added a check to make sure, the Table does not attach the contextChange
event handler twice.
The additional event handler call messed up the selection of the rows.

Change-Id: I2b68573d8a315987893953637edf767ab0e2d3dc
Merge "[FIX] AnalyticalTable: Event Handlers for contextChange were registered twice"