[GHC] #10320: -ddump-to-file should create empty dump files when there was nothing to dump

[GHC]

#10320: -ddump-to-file should create empty dump files when there was nothing to
dump
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              Reporter:  rwbarton    |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  low         |         Milestone:
             Component:  Compiler    |           Version:  7.10.1
              Keywords:  newcomer    |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |        Blocked By:
             Test Case:              |   Related Tickets:
              Blocking:              |
Differential Revisions:              |
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 For example, I ran with -ddump-rule-firings -ddump-to-file when there were
 no rule firings. GHC should have created an empty foo.dump-rule-firings
 file. (Instead it left the existing foo.dump-rule-firings from a previous
 run intact, which could have been misleading if I didn't already know that
 the most recent run had no rule firings.)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10320>
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