upload_files_to_datastore() fails if only one file is uploaded

[oliverbeagley]

Describe the bug
upload_files_to_datastore() fails if a length 1 character vector is used.

This is likely due to reticulate converting length 1 vectors to scalars rather than to a length 1 list.

To Reproduce

library(azuremlsdk)
workspace <- load_workspace_from_config()
datastore <- get_datastore(workspace, "workspaceblobstore")

upload_files_to_datastore(datastore = datastore, files = "test")
#>  Error in py_call_impl(callable, dots$args, dots$keywords) : 
#>   UserErrorException: UserErrorException:
#>     Message: 't' does not point to a file. Please upload the file to cloud first if running in a cloud notebook.
#>     InnerException None
#>     ErrorResponse 
#> {
#>     "error": {
#>         "code": "UserError",
#>         "message": "'t' does not point to a file. Please upload the file to cloud first if running in a cloud notebook."
#>     }
#> } 

Using a list instead works eg

upload_files_to_datastore(datastore = datastore, files = list("test"))

Expected behavior

For the function to work with single files.

Wrapping the files argument in as.list() before internally calling datastore$upload_files() might be a possible fix

[diondrapeck]

Thank you, @oliverbeagley! We'll make a work item to make the documentation and behavior consistent with each other.