At least prevent the segfault if a proc isn't found in a sparse group

This commit was SVN r27196.

ompi/mca/dpm/orte/dpm_orte.c

@@ -268,8 +268,12 @@ static int connect_accept ( ompi_communicator_t *comm, int root,
         } else {
             proc_list = (ompi_proc_t **) calloc (group->grp_proc_count, 
                                                  sizeof (ompi_proc_t *));
-            for(i=0 ; i<group->grp_proc_count ; i++)
-                proc_list[i] = ompi_group_peer_lookup(group,i);
+            for (i=0 ; i<group->grp_proc_count ; i++) {
+                if (NULL == (proc_list[i] = ompi_group_peer_lookup(group,i))) {
+                    ORTE_ERROR_LOG(ORTE_ERR_NOT_FOUND);
+                    rc = ORTE_ERR_NOT_FOUND;
+                    goto exit;
+                }
                 
                 OPAL_OUTPUT_VERBOSE((3, ompi_dpm_base_output,
                                      "%s dpm:orte:connect_accept adding %s to proc list",
@@ -277,6 +281,7 @@ static int connect_accept ( ompi_communicator_t *comm, int root,
                                      ORTE_NAME_PRINT(&proc_list[i]->proc_name)));
                 ompi_proc_pack(proc_list, size, nbuf);
             }
+        }
         
         /* pack wireup info - this is required so that all involved parties can
          * discover how to talk to each other. For example, consider the case