Keep check_version from failing if no internet connection

R/regex_gadget.R

   ok_to_check <- getOption("regexplain.no.check.version", TRUE)
   if (!ok_to_check) return(NULL)
   if (!requireNamespace('jsonlite', quietly = TRUE)) return(NULL)
-  gh_tags <- jsonlite::fromJSON(
-    paste0("https://api.github.com/repos/", gh_user, "/", gh_repo, "/git/refs/tags"),
-    simplifyDataFrame = TRUE
-  )
-  gh_tags$tag <- sub("refs/tags/", "", gh_tags$ref, fixed = TRUE)
-  gh_tags$version <- sub("^v\\.?", "", gh_tags$tag)
-  if (any(gh_tags$version > this_version)) {
+  gh_tags <- NULL
+  try({
+    gh_tags <- jsonlite::fromJSON(
+      paste0("https://api.github.com/repos/", gh_user, "/", gh_repo, "/git/refs/tags"),
+      simplifyDataFrame = TRUE
+    )
+    gh_tags$tag <- sub("refs/tags/", "", gh_tags$ref, fixed = TRUE)
+    gh_tags$version <- sub("^v\\.?", "", gh_tags$tag)
+  })
+  if (!is.null(gh_tags) && any(gh_tags$version > this_version)) {
     max_version <- max(gh_tags$version)
     max_tag <- gh_tags$tag[gh_tags$version == max_version]
     options(regexplain.no.check.version = FALSE)