Fixing failed vignette build

[Max-Bladen]

SOURCE:
#169

[Max-Bladen]

Unable to reproduce this issue in a local R or Rmd file.

Thought issue was exclusive to plotLoadings(), but even when all chunks with this function are set to eval = FALSE, GitHub action fails at different point in the code.

Searching for length(class2) within all files yields nothing, so it is likely an issue caused by a function within one of the packages mixOmics is dependent on.

Might need your help on this one @aljabadi

[Max-Bladen]

Even when all code chunks are set to eval = FALSE within vignette.Rmd, the checks still fail. It is drawn from different functions, but the error that is raised is the same.

[aljabadi]

@Max-Bladen let's see if #174 is successful. If so, we'll use the stable version of R and Bioc until the dust settles.

[aljabadi]

@Max-Bladen build is now fine with stable versions. We can safely ignore these changes :)