Commits on Mar 27, 2017

1. Don't error with zero length elem in add_to_last …

   The following expression from **Rmpi** raises an error due to `breaks_tail` seeing a zero length breaks.
   ```{r}
    function (dellog = TRUE, comm = 1) {
     if (mpi.comm.size(comm) < 2) {
       err <- paste("It seems no slaves running on comm", comm)
       stop(err)
     }
     mpi.bcast.cmd(cmd = break, rank = 0, comm = comm)
     if (.Platform$OS != "windows") {
       if (dellog && mpi.comm.size(0) < mpi.comm.size(comm)) {
         tmp <- paste(Sys.getpid(), "+", comm, sep = "")
         logfile <- paste("*.", tmp, ".*.log", sep = "")
         if (length(system(paste("ls", logfile), TRUE, ignore.stderr = TRUE)) >= 
             1)
           system(paste("rm", logfile))
       }
     }
     if (comm > 0) {
       if (is.loaded("mpi_comm_disconnect")) 
         mpi.comm.disconnect(comm)
       else mpi.comm.free(comm)
     }
   }
   ```

   CSJCampbell committed Mar 27, 2017
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