Fix suggestion crash if parser fails to parse dismiss rule

We store a index value in shared pref to figure out when a suggestion
should be displayed next time. However the rule can change due to
various reasons. When the index and the rule itself go out of sync, we
should not crash.

Change-Id: Id3ea88b6d321434e20ac0cd3e2670524c237e24e
Bug: 63908636
Test: robotests
(cherry picked from commit 4d37a1a1)