[GHC] #6119: complain when ghc-pkg doesn't find any matching packages in a given database

[GHC]

#6119: complain when ghc-pkg doesn't find any matching packages in a given
database
-------------------------------------+-------------------------------------
        Reporter:  dmwit             |                Owner:  sibi
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  ghc-pkg           |              Version:  7.4.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10785            |  Differential Rev(s):
       Wiki Page:                    |  https://phabricator.haskell.org/D1575
-------------------------------------+-------------------------------------

Comment (by Ben Gamari <ben@…>):

 In [changeset:"3d55e41e72dc32281744c52afea380c1db577ee1/ghc"
 3d55e41e/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="3d55e41e72dc32281744c52afea380c1db577ee1"
 ghc-pkg: Restore old behavior in colored version; fixes 6119

 The behavior is changed to this:
 ```
 ghc-pkg list blahblah
 /home/sibi/ghc/inplace/lib/package.conf.d
     (no packages)
 ```
 instead of:
 ```
 ghc-pkg list blahblah
 /home/sibi/ghc/inplace/lib/package.conf.d
 ```

 Reviewers: austin, thomie, bgamari

 Reviewed By: thomie, bgamari

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D1575

 GHC Trac Issues: #6119
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/6119#comment:7>
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