[#11386] - title columns and details column mismatch cause to generate extra commas as seperator

I have to create a report with two header columns and 9 detail columns.when generating csv it creates header section with extra commas to match the columns in detail.Below is the sample
Version,Report Date,Partner Name,,,,,
1,26 Nov 2018 06:01:,test,,,,,
MDN,MDN Status,Campaign ID,Subscription Type,Subscription Status,Subscription Activation,Last Subscription Activity,Last Charge Date
2221112227,ACTIVE,cass_prod_sub1,SUBSCRIPTION,ACTIVE,18 Jun 2018 05:18:47 PM ,18 Jun 2018 05:34:21 PM ,18 Nov 2018 05:18:48