fix upnp edge case

-fixes https://github.com/lbryio/lbry/issues/1352

CHANGELOG.md

@@ -20,6 +20,7 @@ at anytime.
   * edge cases of http mirrored download of blobs
   * ports with upnp redirects not showing the correct external port in log messages ( https://github.com/lbryio/lbry/issues/1338 )
   * miniupnpc fallback issue in txupnp ( https://github.com/lbryio/lbry/issues/1341 )
+  * upnp error when disabled on router and a non-gateway is found, such as chromecast ( https://github.com/lbryio/lbry/issues/1352 )
 
 ### Deprecated
   * automatic claim renew, this is no longer needed

lbrynet/daemon/Components.py

@@ -683,8 +683,12 @@ class UPnPComponent(Component):
         elif found and self.upnp.miniupnpc_runner:
             log.warning("failed to set up redirect with txupnp, miniupnpc fallback was successful")
         if found:
-            self.external_ip = yield self.upnp.get_external_ip()
-            yield self._setup_redirects()
+            try:
+                self.external_ip = yield self.upnp.get_external_ip()
+                yield self._setup_redirects()
+            except Exception as err:
+                log.warning("error trying to set up upnp: %s", err)
+                self.external_ip = CS.get_external_ip()
         else:
             self.external_ip = CS.get_external_ip()