Fix NPE in SyModuleImpl

Here is the stacktrace, the feed in question was http://lwn.net/headlines/rss:
22:39:09.900 [main] ERROR c.s.s.feed.impl.CloneableBean - Error while cloning bean
java.lang.reflect.InvocationTargetException: null
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_51]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_51]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_51]
	at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_51]
	at com.sun.syndication.feed.impl.CloneableBean.beanClone(CloneableBean.java:180) ~[rome-2.0.0-SNAPSHOT.jar:na]
	at com.sun.syndication.feed.impl.ObjectBean.clone(ObjectBean.java:92) [rome-2.0.0-SNAPSHOT.jar:na]
	at com.sun.syndication.feed.module.ModuleImpl.clone(ModuleImpl.java:58) [rome-2.0.0-SNAPSHOT.jar:na]
	at com.sun.syndication.feed.module.impl.ModuleUtils.cloneModules(ModuleUtils.java:39) [rome-2.0.0-SNAPSHOT.jar:na]
	at com.sun.syndication.feed.synd.impl.ConverterForRSS090.copyInto(ConverterForRSS090.java:56) [rome-2.0.0-SNAPSHOT.jar:na]
	at com.sun.syndication.feed.synd.impl.ConverterForRSS10.copyInto(ConverterForRSS10.java:47) [rome-2.0.0-SNAPSHOT.jar:na]
	at com.sun.syndication.feed.synd.SyndFeedImpl.<init>(SyndFeedImpl.java:170) [rome-2.0.0-SNAPSHOT.jar:na]
	at com.sun.syndication.io.SyndFeedInput.build(SyndFeedInput.java:133) [rome-2.0.0-SNAPSHOT.jar:na]
..
Caused by: java.lang.NullPointerException: null
	at com.sun.syndication.feed.module.SyModuleImpl.getUpdateBase(SyModuleImpl.java:122) ~[rome-2.0.0-SNAPSHOT.jar:na]