### Description

On creating dispatcher with `kamctl` in the case of `db_text` it fails

### Troubleshooting

#### Reproduction

Point `kamctlrc` to DB_TEXT.

Run `kamctl dispatcher add 1 sip:asterisk_2:5060 1 3` Run 'kamctl dispatcher add 1 sip:asterisk_2:5060 1 3 'prefix=123' 'test1'' Run 'kamctl dispatcher show' Run 'kamctl dispatcher reload'

#### Debugging Data

``` # kamctl dispatcher add 1 sip:asterisk_2:5060 1 3 attrs cannot be empty or null -e \E[37;31mERROR: dispatcher - SQL Error ```

``` # kamctl dispatcher add 1 sip:asterisk_2:5060 1 3 'prefix=123' 'test1' Traceback (most recent call last): File "/usr/lib/x86_64-linux-gnu/kamailio//kamctl/dbtextdb/dbtextdb.py", line 1243, in <module> main(sys.argv) File "/usr/lib/x86_64-linux-gnu/kamailio//kamctl/dbtextdb/dbtextdb.py", line 1230, in main dataset = conn.Execute(' '.join(argv[1:])) File "/usr/lib/x86_64-linux-gnu/kamailio//kamctl/dbtextdb/dbtextdb.py", line 423, in Execute self.WriteTempTable() File "/usr/lib/x86_64-linux-gnu/kamailio//kamctl/dbtextdb/dbtextdb.py", line 1138, in WriteTempTable self.temp_file.write(header.strip() + '\n') File "/usr/lib/python3.7/tempfile.py", line 620, in func_wrapper return func(*args, **kwargs) TypeError: a bytes-like object is required, not 'str' -e \E[37;31mERROR: dispatcher - SQL Error ```

dump is showing active dispatchers, show - is not. ``` # kamctl dispatcher dump { "jsonrpc": "2.0", "result": { "NRSETS": 1, "RECORDS": [{ "SET": { "ID": 1, "TARGETS": [{ "DEST": { "URI": "sip:asterisk_2:5060", "FLAGS": "AP", "PRIORITY": 0 } }] } }] }, "id": 124 } root@e529c8cb4f62:/# kamctl dispatcher show -e dispatcher gateways ```

No result on reload ``` # kamctl dispatcher reload { "jsonrpc": "2.0", "result": { }, "id": 160 } ```

### Possible Solutions

I've tried to add data to the table manually, but here I got another issue.

But on Kamailio load, the only first dispatcher is processed. Will add another issue on this.

### Additional Information

* **Kamailio Version** - output of `kamailio -v`

``` /# kamailio -v version: kamailio 5.4.1 (x86_64/linux) flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: unknown compiled with gcc 8.3.0 ```

* **Operating System**:

Debian 10/Docker

``` # uname -a Linux 9b7efa852274 5.3.18-lp152.36-default #1 SMP Tue Aug 18 17:09:44 UTC 2020 (885251f) x86_64 GNU/Linux ```