Aa a user I would like to see better error reporting from 
DefaultPluginRealmCache#pluginHashCode method
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                 Key: MNG-4648
                 URL: http://jira.codehaus.org/browse/MNG-4648
             Project: Maven 2 & 3
          Issue Type: Improvement
          Components: Settings
            Reporter: Ivica Loncar
            Priority: Minor


As a user i would like to see better error reporting from 
DefaultPluginRealmCache#pluginHashCode method

Currently it calculates hash value based on a dependency metadata, but if I 
omit version it fails with NullPointer exception.

It would be more user friendly to validate metadata prior to calculating hash 
value and to display more meaningful error to the end user.

Test scenario:
 - configure plugin and create dependencies
 - add dependency but DO NOT specify version
 - run maven such that plugin is invoked
maven will fail without reporting which dependency doesn't have version

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