DRL applies even if groupflow was not assigned

For version 7.5

1. Given Traffic repo
2. Edit DRL driver status rules

   rule "Status 1: young driver"
     when
       driver: Driver(age <= 18)
     then
       driver.setStatus("young");
   end
   
   rule "Status 2: young adult driver"
     when
       driver: Driver(age > 18 && < 25)
     then
       driver.setStatus("young adult");
   end
   
   rule "Status 3: adult driver"
     when
       driver: Driver(age >= 25)
     then
       driver.setStatus("adult");
   end 

1. Go to Driver Status Rules Tests.scesim
2. Run the Tests

Expected : Tests failed bcs the values null expected (no DRL rules are applied)
Actual: Tests passed rules group was not updated