Description of problem:
Original subcomponent value lost when click edit search, this error only happened to the subcomponent which is grandchild of a component, The subcomponent which is child of a component couldn't reproduce this bug.  

Version-Release number of selected component (if applicable):
5.0.3.rh6

How reproducible:
always

Steps to Reproduce:
1.Go to Advanced Search, try to search bugs by subcomponent field
2.Fill in query with below conditions:
classification:Red Hat 
product:Red Hat Enterprise Linux 7  
component:kernel 
subcomponent:  Audit
3.Click 'Search' button
4.Show bug list,click 'Edit Search' button

Actual results:
The original subcomponent '  Audit' value lost

Expected results:
The original subcomponent '  Audit' value still keep in the input box

Additional info:
But for the subcomponent which is just child of a component couldn't reproduce this bug, like fill in query with below conditions:
classification:Red Hat
product:Red Hat Enterprise Linux 7
component:kernel
subcomponent:File Systems