[Bug]: Bookmarking-related error

The following app runs correctly when `teal.transform` is on `main` but fails on `898_save_app_stata3@main`.
(All other packages on `898_save_app_stata3@main`).

app code

```
options(teal.log_level = "ERROR", teal.show_js_log = FALSE)
options(teal.log_muffle = FALSE)

rm(list =ls())

devtools::load_all("../teal.reporter")
# devtools::load_all("../teal.transform")
devtools::load_all("../teal")
devtools::load_all("../teal.modules.clinical")

# ======

library(nestcolor)

ADSL <- tmc_ex_adsl
ADTTE <- tmc_ex_adtte
ADSL$RACE <- droplevels(ADSL$RACE) %>% with_label("Race")

arm_ref_comp <- list(
ARM = list(
ref = "B: Placebo",
comp = c("A: Drug X", "C: Combination")
),
ARMCD = list(
ref = "ARM B",
comp = c("ARM A", "ARM C")
)
)

app <- init(
data = cdisc_data(
ADSL = ADSL,
ADTTE = ADTTE,
code = "
ADSL <- tmc_ex_adsl
ADTTE <- tmc_ex_adtte
ADSL$RACE <- droplevels(ADSL$RACE) %>% with_label(\"Race\")
"
),
modules = modules(
tm_g_forest_tte(
label = "Forest Survival",
dataname = "ADTTE",
arm_var = choices_selected(
variable_choices(ADSL, c("ARM", "ARMCD")),
"ARMCD"
),
arm_ref_comp = arm_ref_comp,
paramcd = choices_selected(
value_choices(ADTTE, "PARAMCD", "PARAM"),
"OS"
),
subgroup_var = choices_selected(
variable_choices(ADSL, names(ADSL)),
c("BMRKR2", "SEX")
),
strata_var = choices_selected(
variable_choices(ADSL, c("STRATA1", "STRATA2")),
"STRATA2"
)
)
)
)

# ======

runApp(app, launch.browser = TRUE)
```

```
Listening on http://127.0.0.1:5301
Initializing reporter_previewer_module
Warning: Error in as.name: invalid data of mode 'character' (too short)
141: as.name
140: template_forest_tte [/home/users/chlebowa/NEST/teal.modules.clinical/R/tm_g_forest_tte.R#145]
139: [/home/users/chlebowa/NEST/teal.modules.clinical/R/tm_g_forest_tte.R#639]
123: all_q
122:
106: plot_r
97: renderUI
96: func
83: renderFunc
82: output$teal-main_ui-root-forest_survival-module-myplot-plot_out_main
1: runApp
Warning: Error in as.name: invalid data of mode 'character' (too short)
1: runApp
```