Continue pulling when a remote branch doesn't exist

hggithub.py

@@ -17,12 +17,15 @@ command = registrar.command(cmdtable)
 
 def cmd(description, *args, **kwargs):
     print(description)
+    if "quiet" in kwargs:
+        quiet = kwargs.pop("quiet")
     try:
         kwargs["stderr"] = STDOUT
         check_output(*args, **kwargs)
     except CalledProcessError as ex:
-        print(ex.output).strip()
-        print("Command exited with code %d" % ex.returncode)
+        if not quiet:
+            print(ex.output).strip()
+            print("Command exited with code %d" % ex.returncode)
         raise
 
 
@@ -108,11 +111,15 @@ def _ghpull(git_repo):
     git_pull_master(git_repo)
     for branch in branches.splitlines():
         if branch != "master":
-            cmd(
-                "Fetching branch %s from remote Git fork repository" % branch,
-                ["git", "fetch", "origin", "%s:%s" % (branch, branch)],
-                cwd=git_repo,
-            )
+            try:
+                cmd(
+                    "Fetching branch %s from remote Git fork repository" % branch,
+                    ["git", "fetch", "origin", "%s:%s" % (branch, branch)],
+                    cwd=git_repo,
+                    quiet=True,
+                )
+            except CalledProcessError:
+                print("Couldn't fetch remote branch, ignoring")
     hg_pull()