package help index failing after load_all

[vspinu]

Steps to reproduce with pkgload itself:

> devtools::load_all('path/to/pkgload')
...
> help(package = "pkgload", help_type = "text")
Error in is.character(topic) : object 'topic_str' not found
> traceback()
11: stop(e)
10: value[[3L]](cond)
9: tryCatchOne(expr, names, parentenv, handlers[[1L]])
8: tryCatchList(expr, classes, parentenv, handlers)
7: tryCatch(if (missE) ...elt(i) else eval(cl.i, envir = envir), 
       error = function(e) {
           e$call <- cl.i
           stop(e)
       })
6: withCallingHandlers(tryCatch(if (missE) ...elt(i) else eval(cl.i, 
       envir = envir), error = function(e) {
       e$call <- cl.i
       stop(e)
   }), warning = function(w) {
       w$call <- cl.i
       w
   })
5: stopifnot(is.character(topic), length(topic) == 1)
4: dev_topic_parse(topic, dev_packages)
3: dev_topic_find(topic, dev_packages)
2: dev_help(topic_str, package_str)
1: help(package = "pkgload", help_type = "text")

Expected behavior:

> library(pkgload)
> help(package = "pkgload", help_type = "text")

		Information on package ‘pkgload’

Description:

Package:          pkgload
Title:            Simulate Package Installation and Attach
Version:          1.0.0
....

[vspinu]

Thanks!

[jimhester]

This isn't really a perfect fix, as we don't have all the indexes a fully installed package would have to populate the help, but at least now it does not error.