fix: handle failed lsp resolve request gracefully

lua/blink/cmp/sources/lsp.lua

@@ -163,10 +163,11 @@ function lsp:resolve(item, callback)
   -- strip blink specific fields to avoid decoding errors on some LSPs
   item = require('blink.cmp.sources.lib.utils').blink_item_to_lsp_item(item)
 
-  local _, request_id = client.request('completionItem/resolve', item, function(error, resolved_item)
+  local success, request_id = client.request('completionItem/resolve', item, function(error, resolved_item)
     if error or resolved_item == nil then callback(item) end
     callback(resolved_item)
   end)
+  if not success then callback(item) end
   if request_id ~= nil then return function() client.cancel_request(request_id) end end
 end