tk_tbl.zoo() needs to check input before passing to readr::type_convert() to avoid annoying warning messages

[jarodmeng]

The issue surfaced in business-science/tidyquant#202 but has its root here in timetk, especially in timetk::tk_tbl.zoo(). readr::type_convert() was changed after tidyverse/readr#1020 which makes it give warning when the input doesn't have any character columns.

It should be a simple fix to check the input passed to readr::type_convert(). I will submit a PR to fix it.

[pverspeelt]

@mdancho84,

Is this issue going to be picked up and closed in the PR that @jarodmeng created? The warnings are annoying and some people see them as errors.

[mdancho84]

Sorry I must have missed this. Just merged.

[pverspeelt]

When this is passed on to cran, you should be able to close issue 202 from tidyquant. (and maybe some related ones as well)

[mdancho84]

Ok great. I have a few things I want to check because there are a few other spots I believe typeconvert shows up.