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    Type:Bug 
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    Resolution: Done
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    Priority:Major - P3 
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    Affects Version/s: 2.0.2
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    Component/s: Public API
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The drop method on Collection, in the shell and most other drivers, trap a failed dropCollection command and check if error message is "ns not found", and if it is, return normally.
The Ruby driver throws:
D, [2015-04-01T09:14:55.595000 #59304] DEBUG -- : MONGODB | Adding 127.0.0.1:27017 to the cluster. | runtime: 0.0000ms
D, [2015-04-01T09:14:55.891000 #59304] DEBUG -- : MONGODB | COMMAND | namespace=admin.$cmd selector={:ismaster=>1} flags=[] limit=-1 skip=0 project=nil | runtime: 113.0002ms
D, [2015-04-01T09:14:55.900000 #59304] DEBUG -- : MONGODB | COMMAND | namespace=test.$cmd selector={:drop=>"test"} flags=[:slave_ok] limit=-1 skip=0 project=nil | runtime: 3.9999ms
D, [2015-04-01T09:14:55.905000 #59304] DEBUG -- : MONGODB | COMMAND | namespace=test.$cmd selector={:drop=>"test"} flags=[:slave_ok] limit=-1 skip=0 project=nil | runtime: 3.0000ms
Mongo::Error::OperationFailure: ns not found ()
        validate! at /Users/jeff/.rvm/gems/jruby-1.7.10/gems/mongo-2.0.2/lib/mongo/operation/result.rb:214
          execute at /Users/jeff/.rvm/gems/jruby-1.7.10/gems/mongo-2.0.2/lib/mongo/operation/command.rb:51
  with_connection at /Users/jeff/.rvm/gems/jruby-1.7.10/gems/mongo-2.0.2/lib/mongo/server/connection_pool.rb:99
  with_connection at /Users/jeff/.rvm/gems/jruby-1.7.10/gems/mongo-2.0.2/lib/mongo/server/context.rb:62
          execute at /Users/jeff/.rvm/gems/jruby-1.7.10/gems/mongo-2.0.2/lib/mongo/operation/command.rb:50
          command at /Users/jeff/.rvm/gems/jruby-1.7.10/gems/mongo-2.0.2/lib/mongo/database.rb:131
             drop at /Users/jeff/.rvm/gems/jruby-1.7.10/gems/mongo-2.0.2/lib/mongo/collection.rb:94
           (root) at src/ruby_driver_test.rb:10