Failed to show hold call when user click swap and merge simultaneously

Set EVENT_MERGE_START for foregroundConnection and backgroundConnection
but don't set EVENT_MERGE_COMPLETE when there is ImsException

Bug: 121105030

Change-Id: Ib376b24e5d307d8907d7ec2c8a3e025c04682d88
(cherry picked from commit 7890b99b3a79a21b101b0f7bcd7454421ec95791)
1 file changed