Fix wrong WARNING when own ip is unknown at startup

re6st/cache.py

@@ -203,12 +203,15 @@ class Cache(object):
     def my_address(self):
         for x, in self._db.execute("SELECT address FROM peer WHERE NOT prefix"):
             return x
-        return ''
 
     @my_address.setter
-    def my_address(self, *args):
-        with self._db as db:
-            db.execute("INSERT OR REPLACE INTO peer VALUES ('', ?)", args)
+    def my_address(self, value):
+        if value:
+            with self._db as db:
+                db.execute("INSERT OR REPLACE INTO peer VALUES ('', ?)",
+                           (value,))
+        else:
+            del self.my_address
 
     @my_address.deleter
     def my_address(self):

re6st/tunnel.py

@@ -213,12 +213,14 @@ class BaseTunnelManager(object):
         if any(address_dict.itervalues()):
             del cache.my_address
         else:
-            for address in utils.parse_address(cache.my_address):
-                try:
-                    proto = proto_dict[address[2]]
-                except KeyError:
-                    continue
-                address_dict[proto[0]].append(address)
+            address = cache.my_address
+            if address:
+                for address in utils.parse_address(address):
+                    try:
+                        proto = proto_dict[address[2]]
+                    except KeyError:
+                        continue
+                    address_dict[proto[0]].append(address)
         db = os.getenv('GEOIP2_MMDB')
         if db:
             from geoip2 import database, errors