Bamboo Xcode plugin on agent which doesn't have `xcodebuild` throws NPE

java.lang.NullPointerException
	at java.io.File.<init>(File.java:277)
	at com.atlassian.bamboo.plugins.xcode.build.XCodeSDKCapabilityTypeModule.addDefaultCapabilities(XCodeSDKCapabilityTypeModule.java:74)
	at com.atlassian.bamboo.v2.build.agent.capability.CapabilityDefaultsHelperImpl$1.run(CapabilityDefaultsHelperImpl.java:54)
	at com.atlassian.bamboo.plugin.BambooPluginUtils$Runnable.call(BambooPluginUtils.java:123)
	at com.atlassian.bamboo.plugin.BambooPluginUtils$Runnable.call(BambooPluginUtils.java:113)
	at com.atlassian.bamboo.plugin.BambooPluginUtils.callUnsafeCode(BambooPluginUtils.java:57)
	at com.atlassian.bamboo.v2.build.agent.capability.CapabilityDefaultsHelperImpl.addDefaultCapabilities(CapabilityDefaultsHelperImpl.java:43)
	at com.atlassian.bamboo.v2.build.agent.remote.AgentRegistrationBean.registerAgent(AgentRegistrationBean.java:50)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:354)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:305)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:133)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:408)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:778)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:93)
	at com.atlassian.bamboo.v2.build.agent.remote.RemoteAgent$1.<init>(RemoteAgent.java:251)
	at com.atlassian.bamboo.v2.build.agent.remote.RemoteAgent.initApplicationContext(RemoteAgent.java:250)
	at com.atlassian.bamboo.v2.build.agent.remote.RemoteAgent.start(RemoteAgent.java:86)
	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 com.atlassian.bamboo.agent.bootstrap.AgentRunner.run(AgentRunner.java:30)
	at java.lang.Thread.run(Thread.java:745)