Merge pull request #359 from oracle/fix_npe_in_main_dispatchservicewatch

replace put with remove in Main.dispatchServiceWatch method

Author: rjeberhard

operator/src/main/java/oracle/kubernetes/operator/Main.java

@@ -891,7 +891,7 @@ private static void dispatchServiceWatch(Watch.Response<V1Service> item) {
             case "DELETED":
               if (sko != null) {
                 if (channelName != null) {
-                  V1Service oldService = sko.getChannels().put(channelName, null);
+                  V1Service oldService = sko.getChannels().remove(channelName);
                   if (oldService != null) {
                     // Service was deleted, but sko still contained a non-null entry
                     LOGGER.info(