Fix group summary suppression logic when without bubbles

The current logic of updateSuppression() concludes there is no child
notification when there is no Bubbles defined.

Bug: 161980186
Bug: 174623537
Test: atest SystemUITests:com.android.systemui.statusbar.notification
Change-Id: Iad4ea8117ef9bd7f813854eb6ed353df64fbdedd
Merged-In: Iad4ea8117ef9bd7f813854eb6ed353df64fbdedd
(cherry picked from commit da2ab115516a1976442c12463904ac3d1fd4ba86)
1 file changed