Bugfix: Do not attempt to read the velocity field when it's not written.

cpp/full_code/kraichnan_field.cpp

@@ -104,26 +104,17 @@ int kraichnan_field<rnumber>::initialize(void)
     DEBUG_MSG("Coefficient: %g\n",
             this->spectrum_coefficient);
 
+    this->generate_random_velocity();
     // is this the first iteration?
     if ((this->iteration == 0) and (this->output_velocity == 1))
     {
         // if yes, generate random field and save it
-        this->generate_random_velocity();
         this->velocity->io(
                 this->get_current_fname(),
                 "velocity",
                 this->iteration,
                 false);
     }
-    else
-    {
-        // if not, read the random field that exists in the checkpoint file
-        this->velocity->io(
-                this->get_current_fname(),
-                "velocity",
-                this->iteration,
-                true);
-    }
 
     return EXIT_SUCCESS;
 }