fix starting with default values when no arguments are passed

main.cpp

@@ -58,6 +58,8 @@ int main(int argc, char **argv)
         }
     }
 
+
+    if (!targ.empty() && !iarg.empty()) {
         try {
             tcount = std::stoi(targ);
             maxiter = std::stoi(iarg);
@@ -65,6 +67,7 @@ int main(int argc, char **argv)
             std::cout << "Invalid arguments." << std::endl;
             exit(1);
         }
+    }
 
     if (tcount == 0 || tcount < 0)
         tcount = 4;