collect_data invents a file "*.csv" if the wildcard fails on client(casu)-side

if there is not a file with a particular extension (/other match in the wildcard specification), perhaps the .dep "results: [...]" should not have it entered.  However, the .csv type is implicit, so even if an application retrieves some other data but no csv file is generated, the file *.csv is created.

Not sure whether fabric.get.api can be configured to handle wildcards better?