minor: fix prev commit

lib/mongo/collection.rb

@@ -169,7 +169,7 @@ module Mongo
       batch_size = opts.delete(:batch_size)
       timeout    = (opts.delete(:timeout) == false) ? false : true
 
-      if !timeout
+      if timeout == false && !block_given?
         raise ArgumentError, "Collection#find must be invoked with a block when timeout is disabled."
       end
 

test/cursor_test.rb

@@ -167,8 +167,9 @@ class CursorTest < Test::Unit::TestCase
     cursor = Cursor.new(@@coll, :timeout => false)
     assert_equal false, cursor.timeout
 
-    cursor = @@coll.find({}, :timeout => false)
-    assert_equal false, cursor.timeout
+    @@coll.find({}, :timeout => false) do |cursor|
+      assert_equal false, cursor.timeout
+    end
   end
 
   def test_timeout