Remove unnecessary empty set check

It isn't harmful to remove the if statement because missing.forEach()
doesn't call the specified lambda when it is empty.

Change-Id: I3f43f5fd4a4422899c621f2a63c0259f1bae838a

@@ -455,13 +455,11 @@ class ConfigProvider implements DeviceProvider, LinkProvider, HostProvider {
                 .filter(cp -> !existing.contains(cp))
                 .filter(cp -> !existing.contains(cp))
                 .collect(Collectors.toSet());
                 .collect(Collectors.toSet());
 
 
-        if (!missing.isEmpty()) {
         List<PortDescription> newPorts = Lists.newArrayList();
         List<PortDescription> newPorts = Lists.newArrayList();
         ports.forEach(p -> newPorts.add(description(p)));
         ports.forEach(p -> newPorts.add(description(p)));
         missing.forEach(cp -> newPorts.add(description(cp)));
         missing.forEach(cp -> newPorts.add(description(cp)));
         deviceProviderService.updatePorts(device.id(), newPorts);
         deviceProviderService.updatePorts(device.id(), newPorts);
     }
     }
-    }
 
 
     // Creates a port description from the specified port.
     // Creates a port description from the specified port.
     private PortDescription description(Port p) {
     private PortDescription description(Port p) {