[Bug]: teal fails if the teal_data has no code

[averissimo]

What happened?

Can't start a teal application without code in teal_data() call

Reproducible example with latest from main

app <- teal::init(
  data = teal_data(IRIS = iris),
  modules = list(example_module())
) |>
  shiny::runApp()
#> Warning in teal.data:::get_code_dependency(attr(datasets, "preprocessing_code"),  :
#>   Objects not found in 'qenv' environment: IRIS
#> Warning: Error in code_dependency: The 'expression' code input does not contain 'srcref' attribute.
#>   1: shiny::runApp
#> 

Doesn't fail (but gives 2 warnings)

app <- teal::init(
    data = teal_data(IRIS = iris, code = ""),
    modules = list(example_module())
) |>
    shiny::runApp()
#> Warning in teal.data:::get_code_dependency(attr(datasets, "preprocessing_code"),  :
#>   Objects not found in 'qenv' environment: IRIS
#> Warning in teal.data:::get_code_dependency(attr(datasets, "preprocessing_code"),  :
#>   Objects not found in 'qenv' environment: IRIS
#> 

sessionInfo()

No response

Relevant log output

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