Parsing dom for plugin xml is buggy

During parsing the DOM for creating plugin, the code assumes that any 'version' tag would be fine to get a version, but in practice this is a perfectly valid plugin xml fragment, where an incorrect version is parsed:
<plugin><groupId>a</groupId><artifactId>b</artifactId><dependencies><dependency><groupId>c</groupId><artifactId>d</artifactId><version>3</version></dependency></dependencies></plugin>

There is a patch to solve it