Description of problem:
Attempt to add a port to SocketBindingGroup resource ends with:
BadArgumentException: configuration not updated: [Required property 'fixed-port' has a null value.

Version-Release number of selected component (if applicable):
Version :	
4.12.0-SNAPSHOT
Build Number :	
494e428

How reproducible:
Always

Steps to Reproduce:
1. navigate to eap6 standalone server resource->SocketBindingGroups->standard-sockets->Configuration
2. click on Add button inside Individual socket bindings section
3. fill in name and port
4. Click on Ok
5. Click on Save

Actual results:
org.rhq.enterprise.server.rest.BadArgumentException:Bad parameter(s) given: Invalid newResourceConfiguration, configuration not updated: [Required property 'fixed-port' has a null value.]


Expected results:
No errors

Additional info:
Exception from server.log:
06:19:09,077 WARN  [org.rhq.coregui.server.gwt.ConfigurationGWTServiceImpl] (http-/0.0.0.0:7080-29) Sending exception to client: [1400581149077] : org.rhq.enterprise.server.rest.BadArgumentException: Bad parameter(s) given: Invalid newResourceConfiguration, configuration not updated: [Required property 'fixed-port' has a null value.]
        at org.rhq.enterprise.server.configuration.ConfigurationManagerBean.updateResourceConfiguration(ConfigurationManagerBean.java:1372) [rhq-server.jar:4.12.0-SNAPSHOT]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0_45]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.7.0_45]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_45]
        at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_45]
        at org.jboss.as.ee.component.ManagedReferenceMethodInterceptorFactory$ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptorFactory.java:72) [jboss-as-ee-7.2.0.Alpha1-redhat-4.jar:7.2.0.Alpha1-redhat-4]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
        at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
        at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:58) [jboss-as-ee-7.2.0.Alpha1-redhat-4.jar:7.2.0.Alpha1-redhat-4]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
        at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:374) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
        at org.rhq.enterprise.server.common.PerformanceMonitorInterceptor.monitorHibernatePerformance(PerformanceMonitorInterceptor.java:32) [rhq-server.jar:4.12.0-SNAPSHOT]
        at sun.reflect.GeneratedMethodAccessor84.invoke(Unknown Source) [:1.7.0_45]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_45]
        at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_45]
        at org.jboss.as.ee.component.ManagedReferenceLifecycleMethodInterceptorFactory$ManagedReferenceLifecycleMethodInterceptor.processInvocation(ManagedReferenceLifecycleMethodInterceptorFactory.java:123) [jboss-as-ee-7.2.0.Alpha1-redhat-4.jar:7.2.0.Alpha1-redhat-4]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
        at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:374) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
        at org.rhq.enterprise.server.common.TransactionInterruptInterceptor.addCheckedActionToTransactionManager(TransactionInterruptInterceptor.java:78) [rhq-server.jar:4.12.0-SNAPSHOT]
.
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