Print the calculated tree for now

lib/importer.py

@@ -146,7 +146,6 @@ class Importer:
                     tprj = root.get("project") or project
                     tpkg = root.get("package") or package
                     dbrev.links_to(db, tprj, tpkg)
-        db.conn.commit()
 
     def find_linked_revs(self, db):
         with db.cursor() as cur:
@@ -304,7 +303,7 @@ class Importer:
             self.obs.request(number).import_into_db(db)
 
         db.conn.commit()
-        # TreeBuilder(db).build(self.package)
+        TreeBuilder(db).build(self.package).print()
 
     def import_all_revisions(self, gc):
         # Fetch all the requests and sort them.  Ideally we should

lib/tree_builder.py

@@ -113,7 +113,8 @@ class TreeBuilder:
                         break
                 if not ended_without_merge:
                     factory_node.merged = None
-                    last_merge.parent = None
+                    if last_merge:
+                        last_merge.parent = None
                 else:
                     last_merge = factory_node.merged
             factory_node = factory_node.parent