[Ad-dev] [openAD] #240: allow blank common

[OpenAD]

#240: allow blank common
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 Reporter:  utke              |       Owner:  utke      
     Type:  enhancement       |      Status:  new       
 Priority:  major             |   Milestone:  AD for SAS
Component:  SourceProcessing  |    Keywords:            
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Ticket URL: <https://trac.mcs.anl.gov/projects/openAD/ticket/240>
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