SIGSEGV with empty COI

It might occur with other combinations, but this is what I found.

When there is an empty COI (ie. COI without any IDP realm or RP realm), and you perform several tidc queries (both successful and failed), it eventually SIGSEGVs.

#0 0x000000000041aedb in tr_comm_sweep_func (head=0x63b550) at common/tr_comm.c:375
        comm = 0x0
        old_next = <optimized out>
#1 tr_comm_table_sweep (ctab=0x636080) at common/tr_comm.c:1389
No locals.
#2 0x000000000040c466 in trps_sweep_ctable (trps=trps@entry=0x634310) at trp/trps.c:1323
        tmp_ctx = 0x636330
        sweep_time = {tv_sec = 11410, tv_nsec = 672013793}
        memb = <optimized out>
        iter = 0x638f90
        rc = TRP_ERROR
#3 0x000000000040603f in tr_trps_sweep (listener=<optimized out>, event=<optimized out>, arg=<optimized out>)
    at tr/tr_trp.c:354
        cookie = <optimized out>
        trps = 0x634310
        ev = 0x639520
        table_str = 0x0
#4 0x00007ffff76923dc in event_base_loop () from /usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
No symbol table info available.
#5 0x0000000000403fd0 in main (argc=<optimized out>, argv=<optimized out>) at tr/tr_main.c:256
        main_ctx = 0x634070
        tr = 0x634150
        opts = {version_requested = 0, config_dir = 0x4277b9 "."}
        ev_base = 0x639b60
        tids_ev = {n_sock_fd = 2, sock_fd = {8, 9, 0, 0, 0, 0, 0, 0, 0, 0}, ev = {0x637e20, 0x6363e0, 0x0, 0x0, 0x0,
            0x0, 0x0, 0x0, 0x0, 0x0}}
        cfgwatch_ev = 0x6390f0