Fix in MavenRepository for NPE caused by Profile.getActivation() returning null

This came to my attention because of the tests I have here: 

https://github.com/droolsjbpm/droolsjbpm-integration/blob/6.0.x/kie-remote/kie-services-client/src/test/java/org/kie/services/client/builder/KieModuleDeploymentHelperTest.java

In particular, testSingleDeploymentHelper() was throwing an NPE: 

    java.lang.NullPointerException
	at org.kie.scanner.MavenRepository.initSettings(MavenRepository.java:55)
	at org.kie.scanner.MavenRepository.getMavenRepository(MavenRepository.java:47)
	at org.kie.scanner.ArtifactResolver.getMavenProjectForGAV(ArtifactResolver.java:78)
	at org.kie.scanner.ArtifactResolver.getResolverFor(ArtifactResolver.java:56)
	at org.kie.scanner.MavenClassLoaderResolver.getClassLoader(MavenClassLoaderResolver.java:48)
	at org.drools.compiler.kie.builder.impl.KieModuleKieProject.<init>(KieModuleKieProject.java:50)
	at org.drools.compiler.kie.builder.impl.KieModuleKieProject.<init>(KieModuleKieProject.java:38)
	at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:190)
	at org.kie.services.client.deployment.KieModuleDeploymentHelperImpl.internalCreateKieJar(KieModuleDeploymentHelperImpl.java:313)
	at org.kie.services.client.deployment.KieModuleDeploymentHelperImpl.internalCreateAndDeployKjarToMaven(KieModuleDeploymentHelperImpl.java:245)
	at org.kie.services.client.deployment.KieModuleDeploymentHelperImpl.createKieJarAndDeployToMaven(KieModuleDeploymentHelperImpl.java:214)
	at org.kie.services.client.builder.KieModuleDeploymentHelperTest.testSingleDeploymentHelper(KieModuleDeploymentHelperTest.java:67)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)