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.

Merged-In: Id3ea88b6d321434e20ac0cd3e2670524c237e24e
Change-Id: Ied4a0359f9bc22ee94ec79c0591d2671a9c31b86
Fix: 63908636
Test: robotests