Inaccurate Rd to html conversion for tables with empty cells #645 Issue is persisting

[aravind-j]

After the issue #645 was closed, the error message has disappeared, but the tables are not still as expected,

The empty cells are shifting.

Here are the links to the specific lines for one such table.

Rd - roxygen2
https://github.com/aravind-j/rmelting/blob/c54cede6852bbff36cf3ae8cd5403fbc2292a0e6/man/melting.Rd#L285-L299

html
https://github.com/aravind-j/rmelting/blob/c54cede6852bbff36cf3ae8cd5403fbc2292a0e6/docs/reference/melting.html#L499-L517

Expected

[hadley]

Even more minimal reprex:

library(pkgdown)

x1 <- "\\tabular{lll}{A \\tab B \\tab C \\cr A \\tab\\tab C}"
cat(rd2html(x1), sep = "\n")
#> Warning in matrix(cell_contents, ncol = length(align), byrow = TRUE): data
#> length [5] is not a sub-multiple or multiple of the number of rows [2]
#> <table class='table'>
#> <tr><td>A</td><td>B</td><td>C</td></tr>
#> <tr><td>A</td><td>C</td><td>A</td></tr>
#> </table>

x2 <- "\\tabular{lll}{A \\tab B \\tab\\cr A \\tab B \\tab C}"
cat(rd2html(x2), sep = "\n")
#> Warning in matrix(cell_contents, ncol = length(align), byrow = TRUE): data
#> length [5] is not a sub-multiple or multiple of the number of rows [2]
#> <table class='table'>
#> <tr><td>A</td><td>B</td><td>A</td></tr>
#> <tr><td>B</td><td>C</td><td>A</td></tr>
#> </table>

^{Created on 2018-11-20 by the reprex package (v0.2.1)}