Fix reference to unused e to satisfy rubocop

docker/docker-compose.yml

@@ -9,6 +9,9 @@ services:
       - type: bind
         source: ${PWD}/vmpooler.yaml
         target: /etc/vmpooler/vmpooler.yaml
+      - type: bind
+        source: ${PWD}/providers.yaml
+        target: /etc/vmpooler/providers.yaml
     ports:
       - "4567:4567"
     networks:
@@ -17,6 +20,9 @@ services:
       - VMPOOLER_DEBUG=true # for use of dummy auth
       - VMPOOLER_CONFIG_FILE=/etc/vmpooler/vmpooler.yaml
       - REDIS_SERVER=redislocal
+      - EXTRA_CONFIG=/etc/vmpooler/providers.yaml
+      - LOGFILE=/dev/stdout
+      - LDAP_PORT=636
     image: vmpooler-local
     depends_on:
       - redislocal

lib/vmpooler/pool_manager.rb

@@ -822,7 +822,7 @@ module Vmpooler
               loop_count += 1
             end
           end
-        rescue Redis::CannotConnectError => e
+        rescue Redis::CannotConnectError
           raise
         rescue StandardError => e
           $logger.log('s', "[!] [#{pool['name']}] Error while checking the pool: #{e}")