Description of problem:

   Export button exports table header information but no data from list on /content_hosts/ when arriving there from clicking on consumers of a subscription on the subscription page.   And when navigating straight to the page via "Hosts" -> "Content Hosts", the export will export everything regardless of what is shown on the page as a result of the search.

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

   Installed from RHEL 6.4.0 snap 9.0

How reproducible:   Always (in my limited lab setup)


Steps to Reproduce:
1.  WebUI -> "Content” 
      -> “Subscriptions” 
        -> Select a subscription with at least 1 consumer 
           -> Click the number next to “Content Hosts”

2.  Click the "Export" button on the resulting page and open in LibreOffice

Actual results:

 Only the header info from the Content Host table is populated into the csv


Expected results:

 The data from the table is populated in the CSV.


Additional info:


  The page in question is the /content_hosts/ page which DOES work exporting when just going to "Hosts" -> "Content Hosts".

  If I do the steps in the reproduction, I get the following URL:
https://satellite.example.com/content_hosts?search=subscription_id%3D4&page=1&per_page=20&sortBy=name&sortOrder=ASC

  (Note:  In my example, the content_host is using subscription_id=4)

   If I just navigate to "Hosts" -> "Content Hosts" -> and search on anything whatsoever, the export still exports all values regardless of whether they are returned by the search or not.

// When Navigating just to "Hosts" -> "Content Hosts"
  example search 1: "subscription_id=4" returns the expected host on the page, and the export CSV exports the headers and the Content Hosts.

  example search 2: "subscription_id=3" returns zero hosts as expected, but the export button still exports the unseen hosts to CSV.