Only create initial node additions if tracing temporal network is actually enabled.

src/init.tex

@@ -199,11 +199,13 @@ Hoverflies are mobile entities which perform their reproductive activities using
             if dest == rank {
                 hoverflies.push(hoverfly);
 
-                temporal_network.node_additions.push((
-                    Tick::default(),
-                    id,
-                    hoverfly.insect.species,
-                ));
+                if params.trace_temporal_network {
+                    temporal_network.node_additions.push((
+                        Tick::default(),
+                        id,
+                        hoverfly.insect.species,
+                    ));
+                }
             }
 
             id += 1;
@@ -260,11 +262,13 @@ Solitary bees are mobile entities which perform their reproductive activities us
             if dest == rank {
                 solitary_bees.push(solitary_bee);
 
-                temporal_network.node_additions.push((
-                    Tick::default(),
-                    id,
-                    solitary_bee.insect.species,
-                ));
+                if params.trace_temporal_network {
+                    temporal_network.node_additions.push((
+                        Tick::default(),
+                        id,
+                        solitary_bee.insect.species,
+                    ));
+                }
             }
 
             id += 1;
@@ -335,11 +339,13 @@ Bumblebees are mobile entities which are always associated to single colony. Hen
                 if dest == rank {
                     bumblebees.push(bumblebee);
 
-                    temporal_network.node_additions.push((
-                        Tick::default(),
-                        id,
-                        bumblebee.insect.species,
-                    ));
+                    if params.trace_temporal_network {
+                        temporal_network.node_additions.push((
+                            Tick::default(),
+                            id,
+                            bumblebee.insect.species,
+                        ));
+                    }
                 }
 
                 id += 1;