[findbugs] Add null check when closing a RevWalk in JGitUtils

James Moger

2014-04-17 87170e14d1260c722c5e534c2e405764153d5946

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[new] 
    duration = 365
    organizationalUnit = Gitblit
    organization = Gitblit
    locality = Gitblit
    stateProvince = NY 
    countryCode = US