add unequal size case to equality operator

libraries/chain/include/eosio/chain/producer_schedule.hpp

@@ -56,6 +56,7 @@ namespace eosio { namespace chain {
    inline bool operator == ( const producer_schedule_type& a, const producer_schedule_type& b ) 
    {
       if( a.version != b.version ) return false;
+      if ( a.producers.size() != b.producers.size() ) return false;
       for( uint32_t i = 0; i < a.producers.size(); ++i )
          if( a.producers[i] != b.producers[i] ) return false;
       return true;