boto_rds.py.patch

diff --git a/salt/modules/boto_rds.py b/salt/modules/boto_rds.py
index 776e65a..30d6569 100644
--- a/salt/modules/boto_rds.py
+++ b/salt/modules/boto_rds.py
@@ -326,8 +326,6 @@ def create_read_replica(name, source_name, db_instance_class=None,
 
         salt myminion boto_rds.create_read_replica replicaname source_name
     '''
-    if not backup_retention_period:
-        raise SaltInvocationError('backup_retention_period is required')
     res = __salt__['boto_rds.exists'](source_name, tags, region, key, keyid, profile)
     if not res.get('exists'):
         return {'exists': bool(res), 'message':
diff --git a/salt/states/boto_rds.py b/salt/states/boto_rds.py
index 6475624..ff3d425 100644
--- a/salt/states/boto_rds.py
+++ b/salt/states/boto_rds.py
@@ -382,7 +382,8 @@ def replica_present(name, source, db_instance_class=None,
            }
     replica_exists = __salt__['boto_rds.exists'](name, tags, region, key,
                                                  keyid, profile)
-    if not replica_exists:
+    if not replica_exists or 'error' in replica_exists \
+            and 'DBInstanceNotFound' in replica_exists['error']['message']:
         if __opts__['test']:
             ret['comment'] = 'RDS read replica {0} is set to be created '.format(name)
             ret['result'] = None
@@ -490,25 +491,21 @@ def subnet_group_present(name, description, subnet_ids=None, subnet_names=None,
 
     exists = __salt__['boto_rds.subnet_group_exists'](name=name, tags=tags, region=region, key=key,
                                                       keyid=keyid, profile=profile)
-    if not exists:
+    if not exists or 'error' in exists \
+            and 'DBSubnetGroupNotFoundFault' in exists['error']['message']:
         if __opts__['test']:
             ret['comment'] = 'Subnet group {0} is set to be created.'.format(name)
             ret['result'] = None
             return ret
-        if not r.get('created'):
-            ret['result'] = False
-            ret['comment'] = 'Failed to create {0} subnet group.'.format(r['error']['message'])
-            return ret
-        created = __salt__['boto_rds.create_subnet_group'](name=name,
+        r = __salt__['boto_rds.create_subnet_group'](name=name,
                                                      description=description,
                                                      subnet_ids=subnet_ids,
                                                      tags=tags, region=region,
                                                      key=key, keyid=keyid,
                                                      profile=profile)
-
-        if not created:
+        if not r.get('created'):
             ret['result'] = False
-            ret['comment'] = 'Failed to create {0} subnet group.'.format(name)
+            ret['comment'] = 'Failed to create {0} subnet group.'.format(r['error']['message'])
             return ret
         ret['changes']['old'] = None
         ret['changes']['new'] = name