init_model_methods doesn't work with CmdStanPathfinder object

[avehtari]

> model1 <- cmdstan_model(stan_file = root("Birthdays", "gpbf1.stan"),
                         include_paths = root("Birthdays"),
                         compile_model_methods=TRUE, force_recompile=TRUE)
Compiling Stan program...
> fit1 <- model1$sample(data=standata1, iter_warmup=100, iter_sampling=100, chains=4, parallel_chains=4)
> fit1$init_model_methods()
Compiling additional model methods...
> pth1 <- model1$pathfinder(data = standata1, init=0.1, num_paths=10, single_path_draws=40,
> pth1$init_model_methods()
Error: Model methods cannot be used with a pre-compiled Stan executable, the model must be compiled again

init_model_methods works also with CmdStanLaplace object

[jgabry]

Thanks for catching this! Should be fixed now as part of #871 (on the branch for the v0.7.0 release).