Thread: pgsql: Remove test for NULL node in ExecProcNode().

Log Message:
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Remove test for NULL node in ExecProcNode().  No place ever calls
ExecProcNode() with a NULL value, so the test couldn't do anything
for us except maybe mask bugs.  Removing it probably doesn't save
anything much either, but then again this is a hot-spot routine.

Modified Files:
--------------
    pgsql/src/backend/executor:
        execProcnode.c (r1.47 -> r1.48)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execProcnode.c.diff?r1=1.47&r2=1.48)