RStudio crashes when read_html()ing an empty html

[tomasbarcellos]

I have first send this issue as a rvest issue (#179), but I was convinced that it should acctualy be at this project.

RStudio crashes when trying to read an empty html (the download failed and I was not aware). It is similar to this readr issue: #378. As you can see below, the error is not in xml2::read_html(), it produces the proper output:

> library(rvest)
> tf <- tempfile()
> file.create(tf)
[1] TRUE
> html_error <- read_html(tf)
> str(html_error)
List of 2
 $ node:<externalptr> 
 $ doc :<externalptr> 
 - attr(*, "class")= chr [1:2] "xml_document" "xml_node"

If I then enter html_error %>% html_nodes('h1') %>% html_text() it crashes. No warning nor error message is given; it would be handy.

Here is my sessionInfo():

> sessionInfo()
R version 3.3.2 (2016-10-31)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

locale:
[1] LC_COLLATE=Portuguese_Brazil.1252  LC_CTYPE=Portuguese_Brazil.1252   
[3] LC_MONETARY=Portuguese_Brazil.1252 LC_NUMERIC=C                      
[5] LC_TIME=Portuguese_Brazil.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] rvest_0.3.2 xml2_1.0.0 

loaded via a namespace (and not attached):
[1] httr_1.2.1     magrittr_1.5   R6_2.2.0       parallel_3.3.2 tools_3.3.2   
[6] NLP_0.1-9      Rcpp_0.12.7    slam_0.1-38    tm_0.6-2      

[isaranja]

R session is aborted when I am trying to do read_html(). I think it is same issue where my URL return empty html. The URL that I am trying to scrape is "http://syndication.traffichaus.com/"

[jimhester]

Fixed by #126