public boolean isInitialized(Object entity) {
        if (nullable) {
            return true;
        }
        Object variable = getValue(entity);
        return variable != null;
    }
public boolean isInitialized(Object entity) {
        if (nullable) {
            return true;
        }
        Object variable = getValue(entity);
        return variable != null;
    }
public boolean isInitialized ( Object entity ) { if ( nullable ) { return true ; } Object variable = getValue ( entity ) ; return variable != null ; }
A {@link PlanningVariable#nullable()} value is always considered initialized, but it can still be reinitialized
with {@link PlanningVariable#reinitializeVariableEntityFilter()}.
@param entity never null
@return true if the variable on that entity is initialized
A {