[PATCH] vim: Ignore instead of erroring out when trying to perform an action on a non-existent thread.

---
 vim/notmuch.vim | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/vim/notmuch.vim b/vim/notmuch.vim
index ad8b7c80..299405f4 100644
--- a/vim/notmuch.vim
+++ b/vim/notmuch.vim
@@ -237,7 +237,11 @@ function! s:search_tag(intags)
        else
                let tags = a:intags
        endif
-       ruby do_tag(get_thread_id, VIM::evaluate('l:tags'))
+ruby << EOF
+       if (id = get_thread_id)
+         do_tag(id, VIM::evaluate('l:tags'))
+       end
+EOF
        norm j
 endfunction
 
@@ -354,13 +358,14 @@ endfunction
 function! s:search_show_thread(mode)
 ruby << EOF
        mode = VIM::evaluate('a:mode')
-       id = get_thread_id
-       case mode
-       when 0;
-       when 1; $cur_filter = nil
-       when 2; $cur_filter = $cur_search
+       if (id = get_thread_id)
+               case mode
+               when 0;
+               when 1; $cur_filter = nil
+               when 2; $cur_filter = $cur_search
+               end
+               VIM::command("call s:show('#{id}')")
        end
-       VIM::command("call s:show('#{id}')")
 EOF
 endfunction
 
@@ -519,6 +524,7 @@ ruby << EOF
        end
 
        def get_thread_id
+               return nil if $threads.empty?
                n = $curbuf.line_number - 1
                return "thread:%s" % $threads[n]
        end
-- 
2.21.0

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