Updated placement.tcl generation script from plc and protobuf netlist.

Flows/util/gen_plc_from_pb.py

@@ -40,6 +40,8 @@ keys = set()
 for line in lines:
   words = line.split()
   if words[0] == 'node':
+    if len(node_list) > 0 and node_list[-1].name == '"__metadata__"':
+        node_list.pop(-1)
     node_list.append(pb_object(node_id))
     node_id += 1
   elif words[0] == 'name:':

Flows/util/plc_pb_to_placement_tcl.py

@@ -58,6 +58,8 @@ keys = set()
 for line in lines:
     words = line.split()
     if words[0] == 'node':
+        if len(node_list) > 0 and node_list[-1].name == '"__metadata__"':
+            node_list.pop(-1)
         node_list.append(pb_object(node_id))
         node_id += 1
     elif words[0] == 'name:':