When deleting a requirement within th error screen, creates null pointer

If you add requirement A, try to add requirement A (this returns an error), then try to delete requirement A.

It seems to go through the validation method when it shouldn't.

java.lang.NullPointerException
at com.atlassian.bamboo.ww2.actions.build.admin.config.ConfigureBuildRequirement.validateRequirement(ConfigureBuildRequirement.java:143)
at com.atlassian.bamboo.ww2.actions.build.admin.config.ConfigureBuildRequirement.doAddRequirement(ConfigureBuildRequirement.java:74)
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:585)
at com.opensymphony.xwork.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:358)
at com.opensymphony.xwork.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:218)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:192)
at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:175)
at com.atlassian.bamboo.ww2.interceptors.BambooWorkflowInterceptor.doIntercept(BambooWorkflowInterceptor.java:33)