omit only NAs in term column

[bbolker]

dwplot does an na.omit step after matching order of term names. I assume that's done to eliminate terms that weren't matched in the specified order, but it has bad side effects for the new version of broom.mixed, which can include a group column in the tidied model that is NA for the fixed effects. This modification looks for NA values only in the term column ...

[bbolker]

there's a second issue here. I don't have an example, but I've made some of the dw_tidy() logic for the by_2sd=FALSE case parallel with the default by_2sd=TRUE case, avoiding the "." semantics which are said (in comments) to be fragile ...

[fsolt]

Thanks, Ben!