Catch errors when listing branches

For projects that do not have an associated repository.

gitlab_deps/deps.py

+import logging
 import re
 
 
@@ -18,6 +19,7 @@ def list_projects(gl, search_pattern):
         search_namespaces=True,
         as_list=False,
         simple=True,
+        archived=False,
     )
     for p in projects:
         yield p.path_with_namespace
@@ -26,7 +28,13 @@ def list_projects(gl, search_pattern):
 def get_branches(gl, project_names):
     for path_with_namespace in project_names:
         p = gl.projects.get(path_with_namespace)
-        for b in p.branches.list():
+        try:
+            branches = p.branches.list()
+        except Exception as e:
+            logging.error('error getting branches for %s: %s',
+                          path_with_namespace, e)
+            continue
+        for b in branches:
             yield (path_with_namespace, b.name)