web.xml parser process cannot handle exception for xml file which does not have the encoding attribute

Description copied from https://bugzilla.redhat.com/show_bug.cgi?id=1184292

Description of problem:
When XMLStreamException occurs by web.xml parser process for xml file which does not have the encoding attribute, e.getLocation()[1] is null. We cannot find cause of exception by NullPointerException.

[1]

• org.jboss.as.web.deployment.WebParsingDeploymentProcessor.java
  #115 } catch (XMLStreamException e) { -> #116 throw new DeploymentUnitProcessingException(MESSAGES.failToParseXMLDescriptor(webXml, e.getLocation().getLineNumber(), e.getLocation().getColumnNumber()), e); #117 }

  catch (IOException e)

  { #118 throw new DeploymentUnitProcessingException(MESSAGES.failToParseXMLDescriptor(webXml), e); #119 }

Version-Release number of selected component (if applicable):
EAP 6.3.2

How reproducible:
Attached web.xml for reproducing.

Steps to Reproduce:
1. Create war application using attached web.xml.
2. Deploy war to EAP.
3. Start EAP.

Actual results:
You can confirm NullPointerException.

15:56:23,190 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-2) MSC000001: Failed to start service jboss.deployment.unit."test.war".PARSE: org.jboss.msc.service.StartException in service jboss.deployment.unit."test.war".PARSE: JBAS018733: Failed to process phase PARSE of deployment "test.war"
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:166) [jboss-as-server-7.4.2.Final-redhat-2.jar:7.4.2.Final-redhat-2]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1980) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1913) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_71]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_71]
at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_71]
Caused by: java.lang.NullPointerException
at org.jboss.as.web.deployment.WebParsingDeploymentProcessor.deploy(WebParsingDeploymentProcessor.java:116)
at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:159) [jboss-as-server-7.4.2.Final-redhat-2.jar:7.4.2.Final-redhat-2]
... 5 more