Default for RECO_NUM_NODES_WORKFLOW_CMP

[chiarazampolli]

@benedikt-voelkel , for https://its.cern.ch/jira/browse/O2-4706
@davidrohr , @martenole : 0 should be invalid as default, but I prefer that it crashes, than to put a meaningless value. Let me know.

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[davidrohr]

I would instead move the definition of RECO_NUM_NODES_WORKFLOW_CMP from line 161 up here.

[davidrohr]

Closing this in favor of #1506