Filter the flow in Talend Components

When building a custom Talend component you might want to ignore certain input rows. I spent a lot of time trying to figure out why my tFileInputCSVFilter component was insisting on printing empty records for the filter flow and for the reject flow, the reason? Just an attribute from /COMPONENT/HEADER node :

HAS_CONDITIONAL_OUTPUTS="true"

In Talend by default when you use a flow from a main template and you don't assign anything to the output connector the result will be an empty record unless you set HAS_CONDITIONAL_OUTPUTS="true".