Fixed refactored code to set date and time variable based on params that came in.

Changed to set date variable from exp[exp_value_key][exp_value_index] only when params_time_key came in.

https://bugzilla.redhat.com/show_bug.cgi?id=1142711
Merge pull request #659 from h-kataria/fixed_refactored_exp_editor_date_selector

Fixed refactored code to set date and time variable based on params that...