Also check for zero-length strings.

This commit was SVN r11499.

ompi/mpi/c/publish_name.c

@@ -41,11 +41,11 @@ int MPI_Publish_name(char *service_name, MPI_Info info,
     if ( MPI_PARAM_CHECK ) {
         OMPI_ERR_INIT_FINALIZE(FUNC_NAME); 
 
-        if ( NULL == port_name ) {
+        if ( NULL == port_name || 0 == strlen(port_name) ) {
             return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG, 
                                           FUNC_NAME);
         }
-        if ( NULL == service_name ) {
+        if ( NULL == service_name || 0 == strlen(service_name) ) {
             return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG, 
                                           FUNC_NAME);
         }