Correlate is incorrect for a one-column data.frame

[antoine-sachet]

This is a variant of #120. Again, you can't reproduce this because you'll hit #119 which I fixed in my fork.

When using a data.frame with only 1 column, the correlation is set to whatever the diagonal terms are set to.

corrr::correlate(mtcars["cyl"])
#> 
#> Correlation method: 'pearson'
#> Missing treated using: 'pairwise.complete.obs'
#> # A tibble: 1 x 2
#>   rowname   cyl
#>   <chr>   <dbl>
#> 1 cyl        NA

^{Created on 2020-10-28 by the reprex package (v0.3.0)}

Note that mtcars["cyl"] is a one-column df, and not a numeric vector (which would be mtcars[["cyl"]]), hence it is a different bug.

This will be fixed in a PR I am working on, but I probably won't fix #120 since the y argument should not be here IMO.

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