Allow to specify non existant classes as "groups"

rg.apache.maven.surefire.util.SurefireReflectionException: java.lang.reflect.InvocationTargetException; nested exception is java.lang.reflect.InvocationTargetException: null
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
	at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
	at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
Caused by: java.lang.RuntimeException: Unable to load category: magnews.testgroups.MinimumAcceptance
	at org.apache.maven.surefire.group.match.SingleGroupMatcher.loadGroupClasses(SingleGroupMatcher.java:134)
	at org.apache.maven.surefire.common.junit48.FilterFactory.createGroupFilter(FilterFactory.java:92)
	at org.apache.maven.surefire.junitcore.JUnitCoreProvider.createJUnit48Filter(JUnitCoreProvider.java:183)
	at org.apache.maven.surefire.junitcore.JUnitCoreProvider.invoke(JUnitCoreProvider.java:115)
	... 9 more
Caused by: java.lang.ClassNotFoundException: magnews.testgroups.MinimumAcceptance
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at org.apache.maven.surefire.group.match.SingleGroupMatcher.loadGroupClasses(SingleGroupMatcher.java:130)
	... 12 more