Fix ruby tests with a new couchdb

tests/sharing/lib/couch.rb

@@ -23,7 +23,9 @@ class Couch
   def instances
     params = { params: { include_docs: true } }
     res = JSON.parse @client["/global%2Finstances/_all_docs"].get(params).body
-    res["rows"].map {|row| row["doc"] }
+    res["rows"].map { |row| row["doc"] }
+  rescue RestClient::NotFound
+    []
   end
 
   def get_doc(db, id)