[ci] fixed whitespace cpplint issue in auto-config (#2488)

helpers/parameter_generator.py

@@ -293,7 +293,7 @@ def gen_parameter_code(config_hpp, config_out_cpp):
             tmp = set_one_var_from_string(name, param_type, checks)
             str_to_write += tmp
     # tails
-    str_to_write += "}\n\n"
+    str_to_write = str_to_write.strip() + "\n}\n\n"
     str_to_write += "std::string Config::SaveMembersToString() const {\n"
     str_to_write += "  std::stringstream str_buf;\n"
     for x in infos:

src/io/config_auto.cpp

@@ -579,7 +579,6 @@ void Config::GetMembersFromString(const std::unordered_map<std::string, std::str
   GetInt(params, "gpu_device_id", &gpu_device_id);
 
   GetBool(params, "gpu_use_dp", &gpu_use_dp);
-
 }
 
 std::string Config::SaveMembersToString() const {