[Minor] Empty reply == success in CH universe

diff --git a/lualib/lua_clickhouse.lua b/lualib/lua_clickhouse.lua
index 7064ac925f146074f2354647dae72bdac555cdcd..99865e6ee3bb268e1e2c073120c69c485c3950e7 100644 (file)
--- a/lualib/lua_clickhouse.lua
+++ b/lualib/lua_clickhouse.lua
@@ -116,8 +116,8 @@ local function parse_clickhouse_response_json(params, data)
   local ucl = require "ucl"
 
   if data == nil then
-    -- clickhouse returned no data (i.e. empty result set): exiting
-    return 'no data', {}
+    -- clickhouse returned no data (i.e. empty result set) considered valid!
+    return nil, {}
   end
 
   if data:match('DB::Exception') then