fix: sometime I can't read readthedocs

qa_dashboard.py

@@ -43,7 +43,10 @@ for number, cube in enumerate(all_cubes):
     is_new_format = f"cubicweb_{cube_normalized_name}" in cube_files
 
     has_doc = bool({"doc", "docs"} & cube_files)  # set intersection
-    has_readthedocs = requests.get(f"https://cubicweb-{cube_normalized_name}.readthedocs.io").status_code == 200
+    try:
+        has_readthedocs = requests.get(f"https://cubicweb-{cube_normalized_name}.readthedocs.io").status_code == 200
+    except requests.exceptions.ConnectionError:
+        has_readthedocs = False
 
     number_of_mrs = len([mr for mr in cube.mergerequests.list(all=True) if mr.state == "opened"])
     number_of_topics = len([x for x in cube.branches.list() if x.name.startswith("topic/")])