MONGOID-5789 Allow nil attribute access (backport of #5836) #3597

Job	Run time
ruby-3.2 driver-current mongodb-6.0 replica_set	12m 15s
ruby-3.1 driver-current mongodb-6.0 replica_set	13m 16s
ruby-3.0 driver-current mongodb-6.0 replica_set	12m 52s
ruby-3.1 driver-master mongodb-6.0 replica_set	12m 42s
ruby-3.0 driver-stable mongodb-6.0 replica_set	12m 34s
ruby-3.1 driver-current mongodb-6.0 server	10m 53s
ruby-3.1 driver-current mongodb-6.0 server	10m 40s
ruby-3.0 driver-current mongodb-6.0 server	10m 29s
ruby-3.0 driver-current mongodb-6.0 server	10m 30s
ruby-3.0 driver-current mongodb-6.0 server	10m 27s
ruby-2.7 driver-current mongodb-6.0 server	10m 27s
jruby-9.3 driver-current mongodb-6.0 server	17m 32s
ruby-3.1 driver-current mongodb-5.0 replica_set	12m 41s
ruby-2.7 driver-current mongodb-4.4 replica_set	12m 52s
ruby-2.7 driver-current mongodb-4.0 replica_set	11m 46s
ruby-2.7 driver-current mongodb-3.6 replica_set	11m 17s
	3h 13m 13s

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