I have a process variable CDT which has following in it: [docTitile=ABC, do

I have a process variable CDT which has following in it:
[docTitile=ABC, docUpload=, docName=Account, docCategory=Test1, docType=Test3, dateIssued=5/5/2016, status=Completed]
[docTitile=DEF, docUpload=Mandatory, docName=Cheque, docCategory=Test2, docType=Test4, dateIssued=5/5/2016, status=Pending]
[docTitile=DEF, docUpload=, docName=Fee, docCategory=Test5, docType=Test6, dateIssued=5/5/2016, status=Pending]

I need to update the rows where column "docUpload" is blank and need to update it with value "Optional". Is this can be achieved by script task. If yes, please provide your suggestions.

OriginalPostID-212735

OriginalPostID-212735