Make sure thread pool has at least 1 worker.
When doing a 'git cl archive' if there are no branches other then master the
command will crash with a 'ValueError: Number of processes must be at least 1'
when attempting to create the thread pool.
This Cl modifies the code to use the maximum of the changes and 1 as the number
of threads to create so we have at least one thread to work with.
Review-Url: https://codereview.chromium.org/2228723003
diff --git a/git_cl.py b/git_cl.py
index 014c3dc..a8eb59f 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -3073,7 +3073,7 @@
pool = ThreadPool(
min(max_processes, len(changes_to_fetch))
if max_processes is not None
- else len(changes_to_fetch))
+ else max(len(changes_to_fetch), 1))
fetched_cls = set()
it = pool.imap_unordered(fetch, changes_to_fetch).__iter__()