java.lang.ArrayIndexOutOfBoundsException from parsing maven-metadata.xml

ArrayIndexOutOfBoundsException is thrown when parsing some maven-metadata.xml files. Please see the attached sample maven-metadata.xml and the proposed patch to fix the problem.

2012-04-17 00:04:43,098 WARN
[org.apache.archiva.repository.metadata.MetadataTools] Unable to read metadata:
/home/y/var/yarchiva/data/repositories/public/yahoo/yinst/listings_reconciliation_framework
/listings-reconciliation-framework/maven-metadata-dist.xml
org.apache.archiva.repository.metadata.RepositoryMetadataException: Unable to
parse metadata xml
file:/home/y/var/yarchiva/data/repositories/public/yahoo/yinst/listings_reconciliation_framework/listing
s-reconciliation-framework/maven-metadata-dist.xml: null Nested exception: null
at
org.apache.archiva.repository.metadata.RepositoryMetadataReader.read(RepositoryMetadataReader.java:95)
at
org.apache.archiva.repository.metadata.MetadataTools.readProxyMetadata(MetadataTools.java:394)
at
org.apache.archiva.repository.metadata.MetadataTools.getMetadatasForManagedRepository(MetadataTools.java:527)
at
org.apache.archiva.repository.metadata.MetadataTools.updateMetadata(MetadataTools.java:437)
at

Caused by: org.apache.archiva.xml.XMLException: Unable to parse metadata xml
file:/home/y/var/yarchiva/data/repositories/public/yahoo/yinst/listings_reconciliation_framework/listings-reconciliation-framework/maven-metadata-dist.xml:
null Nested exception: null
at org.apache.archiva.xml.XMLReader.init(XMLReader.java:113)
at org.apache.archiva.xml.XMLReader.<init>(XMLReader.java:81)
at
org.apache.archiva.repository.metadata.RepositoryMetadataReader.read(RepositoryMetadataReader.java:52)
... 55 more
Caused by: org.dom4j.DocumentException: null Nested exception: null
at org.dom4j.io.SAXReader.read(SAXReader.java:484)
at org.dom4j.io.SAXReader.read(SAXReader.java:365)
at org.apache.archiva.xml.XMLReader.init(XMLReader.java:109)
... 57 more