Iterative solver monitor does not print elpased time, time and tau if one does...

Iterative solver monitor does not print elpased time, time and tau if one does not set timer and time step respectively.

src/TNL/Solvers/IterativeSolverMonitor.hpp

@@ -152,13 +152,19 @@ void IterativeSolverMonitor< Real, Index > :: refresh()
          // verbose == 1, attributes were not updated since the last refresh
          return;
 
-      print_item( " ELA:" );
-      print_item( real_to_string( getElapsedTime(), 5 ), 8 );
-      print_item( " T:" );
-      print_item( real_to_string( (saved) ? saved_time : time, 5 ), 8 );
-      if( (saved) ? saved_timeStep : timeStep > 0 ) {
-         print_item( " TAU:" );
-         print_item( real_to_string( (saved) ? saved_timeStep : timeStep, 5 ), 10 );
+      if( this->timer != nullptr )
+      {
+         print_item( " ELA:" );
+         print_item( real_to_string( getElapsedTime(), 5 ), 8 );
+      }
+      if( this->timeStep > 0 )
+      {
+         print_item( " T:" );
+         print_item( real_to_string( (saved) ? saved_time : time, 5 ), 8 );
+         if( (saved) ? saved_timeStep : timeStep > 0 ) {
+            print_item( " TAU:" );
+            print_item( real_to_string( (saved) ? saved_timeStep : timeStep, 5 ), 10 );
+         }
       }
 
       const std::string displayed_stage = (saved) ? saved_stage : stage;