Properly handle empty arrays returned from plperl functions.

Bug reported by David Wheeler, fix by Alex Hunsaker.
# Please enter the commit message for your changes. Lines starting
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# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
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#       modified:   src/pl/plperl/plperl.c
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# Untracked files:
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#       autom4te.cache/
#       configure.in~
#       doc/src/sgml/ref/grant.sgml~
#       src/backend/port/win32_latch.c~
#       src/bin/psql/command.c~
#       src/include/pg_config.h.win32~
#       src/pl/plpython/plpython.c~
#       src/tools/msvc/pgbison.bat~
#       src/tools/msvc/pgbison.pl.bak
#       src/tools/msvc/pgflex.bat~
#       src/tools/msvc/pgflex.pl.bak
#       src/tools/pgindent/README~
#       src/tools/pgindent/pgindent.pl
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Branch
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REL9_1_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/22a55b3af687806e6b3a08a131d00541774eaade

Modified Files
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src/pl/plperl/plperl.c |   10 +++++++---
1 files changed, 7 insertions(+), 3 deletions(-)


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