Merge pull request #13739 from chrrrles/ipaddr_empty_string

ipaddr filter properly handle addresses on /31 networks

lib/ansible/plugins/filter/ipaddr.py

@@ -80,7 +80,8 @@ def _ip_query(v):
     if v.size == 1:
         return str(v.ip)
     if v.size > 1:
-        if v.ip != v.network:
+        # /31 networks in netaddr have no broadcast address
+        if v.ip != v.network or not v.broadcast:
             return str(v.ip)
 
 def _gateway_query(v):