Tensorboard fails to open if tensorflow prints warnings

[RalphJO]

Hello,

In tensorflow:::tensorboard_version(), if tensorflow gives any warnings the call will fail with Error: invalid version specification '<tensorflow warning text>'

This comes from this line of the code:

tensorflow/R/tensorboard.R

Line 145 in b68aa4a

ver <- package_version(system("tensorboard --version_tb", intern = TRUE))

Please could you consider adding an ignore.stderr = TRUE to the system call so that warnings from tensorflow are not parsed, only the stdout from tensorboard?

ver <- package_version(system("tensorboard --version_tb", intern = TRUE, ignore.stderr = TRUE)) 

Thank you,

Ralph

[t-kalinowski]

Thanks for the bug report! Would you like to submit a PR?

[RalphJO]

PR submitted, thanks.

#606