Docker: ignore errors in the update_weboob.sh script;

docker/fetch.sh

@@ -4,4 +4,3 @@ set -e
 echo "Fetching new housing posts..."
 cd /home/user/app
 python -m flatisfy import -v --config /flatisfy/config.json
-

docker/update_weboob.sh

@@ -3,5 +3,4 @@ set -e
 
 echo "Updating Weboob..."
 cd /home/user/weboob
-git pull
-pip install --upgrade .
+git pull && pip install --upgrade . || echo "Couldn't upgrade Weboob; maybe the server is unreachable?"