[GHC] #13183: Template Haskell needlessly pretty-prints empty instance contexts

[GHC]

#13183: Template Haskell needlessly pretty-prints empty instance contexts
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        Reporter:  RyanGlScott       |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Template Haskell  |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3018
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * status:  new => patch
 * differential:   => Phab:D3018


Comment:

 I think the second option is cleaner, so I went with that approach in
 Phab:D3018.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13183#comment:3>
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