Jean-Philippe Lang b4013dc9f2 Removed the default 0 value for issues foreign keys.
It prevents useless "... where id=0" queries and ensures that *_id attributes default to nil.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11417 e93f8b46-1217-0410-a6f0-8f06a7374b81
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