Replace NAs in str_view

Fixes #217

Author: hadley

NEWS.md

@@ -1,5 +1,7 @@
 # stringr 1.3.0.9000
 
+* `str_view()` handles `NA` values more gracefully (#217)
+
 * `str_replace_all()` with a named vector now respects modifier functions (#207)
 
 * `str_trunc()` is once again vectorised correctly (#203, @austin3dickey).

R/view.R

@@ -36,6 +36,7 @@ str_view <- function(string, pattern, match = NA) {
   str_sub(string[has_match], loc[has_match, , drop = FALSE]) <-
     paste0("<span class='match'>", str_sub(string[has_match], loc[has_match, , drop = FALSE]), "</span>")
 
+  string <- str_replace_na(string)
   bullets <- htmltools::HTML(str_c(
     "<ul>\n",
     str_c("  <li>", string, "</li>", collapse = "\n"),