as has been said already just pop it back onto your airbox and dont worry about it.
Its purpose is to let vapours from the crankcase go back into the airbox so it can be burned in the combustion process. Its all to do with keeping the bike cleaner and greener older bikes used to just vent to atmosphere anyway so no harm will have been done to your bike apart maybe a splash of oil vapour from where the pipe has been venting too.
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