Ignore errors loading artifacts from CircleCI

Previously, this seemed to be ignored, and we'd just get a 0-artifact
count. But now it seems that requesting artifacts for builds that are
incomplete raises a 400 Bad Request.

So ignore those errors and return a 0-length artifact, because that is
already correctly handled by the next step in the workflow.

Author: QuLogic

.circleci/fetch_doc_logs.py

@@ -22,7 +22,7 @@
 from pathlib import Path
 import sys
 from urllib.parse import urlparse
-from urllib.request import urlopen
+from urllib.request import URLError, urlopen
 
 
 if len(sys.argv) != 2:
@@ -38,8 +38,11 @@
     f'{organization}/{repository}/{build_id}/artifacts'
 )
 print(artifact_url)
-with urlopen(artifact_url) as response:
-    artifacts = json.load(response)
+try:
+    with urlopen(artifact_url) as response:
+        artifacts = json.load(response)
+except URLError:
+    artifacts = {'items': []}
 artifact_count = len(artifacts['items'])
 print(f'Found {artifact_count} artifacts')