AWS ELB: Return empty list when no load balancer name was found

When trying to describe a LoadBalancer that doesn't exist, the module crash. Instead of that behavior, this commit will return an empty list when no load balancer is found, allowing to deal next tasks by reading the output of the module.

plugins/modules/elb_classic_lb_info.py

@@ -158,7 +158,12 @@
 @AWSRetry.backoff(tries=5, delay=5, backoff=2.0)
 def list_elbs(connection, names):
     paginator = connection.get_paginator('describe_load_balancers')
-    load_balancers = paginator.paginate(LoadBalancerNames=names).build_full_result().get('LoadBalancerDescriptions', [])
+    try:
+        load_balancers = \
+            paginator.paginate(LoadBalancerNames=names).build_full_result().get('LoadBalancerDescriptions', [])
+    except is_boto3_error_code('LoadBalancerNotFound'):
+        return []
+
     results = []
 
     for lb in load_balancers: