Add a guard to make sure that Manager does not throw an exception when the git version file is not present
Add a guard to make sure that Manager does not throw an exception when the git version file is not present

z000z/couchbase-lite-net,couchbase/couchbase-lite-net,brettharrisonzya/couchbase-lite-net,JiboStore/couchbase-lite-net,couchbase/couchbase-lite-net,brettharrisonzya/couchbase-lite-net,mpapp/couchbase-lite-net,z000z/couchbase-lite-net,couchbase/couchbase-lite-net,JiboStore/couchbase-lite-net,mpapp/couchbase-lite-net