fix assertion in logging

src/broker/log_user_stat.cpp

@@ -26,7 +26,7 @@ std::vector<std::string> BehaviorStat::split_id(){
 boost::basic_format<char> BehaviorStat::format()
 {
     std::vector<std::string> splitting = split_id();
-    PPK_ASSERT_ERROR(splitting.size()<2,
+    PPK_ASSERT_ERROR(splitting.size()>=2,
         "Error logging the job behavior the job_id should be of the format"
         " user_id!job_id");
     return boost::format("%1%,%2%,%3%,%4%,%5%\n") % splitting[0] %