Add undefined checks for slist,jht,jsa,options in GenResultsTable

[abhijitsulhyan]

Currently these optional parameters get passed as parameters even if they are not defined. The scenario produces different results

1. &jht=undefined&jsa=1
2. &jsa=1

The first one produces html table as response and the second one return javascript as response; even though they are equivalent

[abhijitsulhyan]

Any updates on pull request ?