onAttachFragment() with ReportFragment instance is called first since
Support Library 26.1.0 has been applied. Remove assert() and check
instance to fix crash caused by the ReportFragement.
Test: Manual
Change-Id: I5a4d6bdd00ac94c5892527f5fe784b8f19701214
Signed-off-by: Taesu Lee <taesu82.lee@samsung.com>