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The expression can result in zero or more instances, when modeling this difference has to be taken into account. In case you attach an event name to the exit node in the subflow, you will get two the following exit nodes in your floware possible:

• one with the event name and
• one without (only showing '[commit]').
• optionally one or more exit events of type Rollback

The first exit node will be used in case the expression results in one or more instances. The latter (without event name) is triggered when the expression results in zero instances. Both situations have to be modeled, otherwise you could get unexpected behavior. In case you don't attach an event name to the exit node in the subflow, you only see one exit node with '[commit]' in the flow. In that situation that exit event will always be taken, regardless of the number of results. In case the expression results in zero the subflow will be skipped and it continues with the 'main' flow. 

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