release:prepare should fail if the tag already exists
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Key: MRELEASE-165
URL: http://jira.codehaus.org/browse/MRELEASE-165
Project: Maven 2.x Release Plugin
Issue Type: New Feature
Affects Versions: 2.0-beta-4
Reporter: Joerg Schaible
The release plugin should detect an already existing tag in the SCM and fail by
default. This would help to prevent an accitental and unwanted rerelease.
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