Dont print a NULL pointer.

contribs/pmi2/pmi2_api.c

@@ -378,7 +378,8 @@ int PMI2_Initialized(void)
 
 int PMI2_Abort(int flag, const char msg[])
 {
-    PMI2U_printf("aborting job:\n%s", msg);
+	if (mpi)
+		PMI2U_printf("aborting job:\n%s", msg);
 
     /* ignoring return code, because we're exiting anyway */
     PMIi_WriteSimpleCommandStr(PMI2_fd, NULL, ABORT_CMD, ISWORLD_KEY, flag ? TRUE_VAL : FALSE_VAL, MSG_KEY, ((msg == NULL) ? "(null)": msg), NULL);