Description of problem:
The printer description for the HP OfficeJet Pro 7740 does not allow selection of an input paper tray.

Version-Release number of selected component (if applicable):
3.17.6

How reproducible:
100%

Steps to Reproduce:
1. Set up printing to an OfficeJet Pro 7740
2. Try to print to 7740
3. Try to select the paper tray

Actual results:
There is no option to select paper tray 2.

Expected results:
At least two paper trays, number 1 and number 2, should be available to choose from.

Additional info:
Bug was reported on Launchpad, claimed fixed on 2017-03-04, but supposed fix is not present in any released hplip source tarball since then, including 3.17.6 and 3.17.7.  However, I am not able to reopen the bug on Launchpad, nor get any response from any hplip maintainer.  I'm reporting here in hope that the Fedora package maintainer for hplip might have a good upstream contact to prod to get some motion on that this issue.

See also https://answers.launchpad.net/hplip/+question/404234