Add error checking

.allspice/utils/generate_netlist.py

@@ -98,7 +98,10 @@ if __name__ == "__main__":
         for net in nets:
             writer.write(net + "\n")
             pins_on_net = netlist_rows[net]
-            # pins_on_net.sort()
+            try:
+                pins_on_net.sort()
+            except TypeError:
+                pass
             writer.write(" " + " ".join(pins_on_net) + "\n")
 
     print("Generated PCB netlist.", file=sys.stderr)