Subscript out of bounds error thrown for tinytex missing bin dir

[adamconroy]

Getting error Error in subbin[[1]] : subscript out of bounds when opening an Rmd document in some installations of RStudio 1.3

System details

RStudio Edition : Server, maybe Desktop too
RStudio Version : 1.3
OS Version      : 
R Version       : Multiple

Steps to reproduce the problem

1. After installing Rstudio 1.3, delete the bin directory inside tinytex::tinytex_root
2. Restart Rstudio and open an Rmd file
3. Note the error in the console

Describe the problem in detail

We don't properly handle an empty/missing bin folder in the tinytex root currently.

Describe the behavior you expected

An error is not thrown and ensure that tinytex is installed correctly.

• I have read the guide to submitting good bug reports at https://github.com/rstudio/rstudio/wiki/Writing-Good-Bug-Reports .
• I have installed the latest version of RStudio and confirmed that the issue still persists.
• If I am reporting a RStudio crash, I have included a diagnostics report. https://support.rstudio.com/hc/en-us/articles/200321257-Running-a-Diagnostics-Report
• I have done my best to include a minimal, self-contained set of instructions for consistently reproducing the issue.

[jmcphers]

Customer ticket: 51382.

[adamconroy]

Customer ticket: 51487

[kevinushey]

Would be helpful to know how people are ending up in this state as well.

[melissa-barca]

Verified in 1.4.954.