Always correctly activate component, even if no networks are available (

#3841)

Signed-off-by: Kai Kreuzer <kai@openhab.org>

bundles/io/org.eclipse.smarthome.io.transport.mdns/src/main/java/org/eclipse/smarthome/io/transport/mdns/internal/MDNSClientImpl.java

@@ -77,13 +77,9 @@ public void activate() {
                 jmdnsInstances.add(jmdns);
                 logger.debug("mDNS service has been started ({} for IP {})", jmdns.getName(), address.getHostAddress());
             } catch (IOException e) {
-                logger.debug("JmDNS instanciation failed ({})!", address.getHostAddress());
+                logger.debug("JmDNS instantiation failed ({})!", address.getHostAddress());
             }
         }
-        if (jmdnsInstances.isEmpty()) {
-            // we must cancel the activation of this component here
-            throw new IllegalStateException("No mDNS service has been started");
-        }
     }
 
     public void deactivate() {