### Description

crash happens if `lcr_id` passed to any of the functions ``KSR.lcr.load_gws*()`` is not defined in the lcr_gw table.

### Debugging Data

``` Core was generated by `/usr/sbin/kamailio -P /run/kamailio/kamailio.pid -f /etc/kamailio/kamailio.cfg'. Program terminated with signal SIGSEGV, Segmentation fault. (gdb) bt #0 ki_load_gws_furi (_m=0x7f1e66521100, lcr_id=3, ruri_user=0x7ffe1f856360, from_uri=0x7ffe1f856370) at lcr_mod.c:2312 #1 0x00007f1e65d8ca35 in sr_apy_kemi_exec_func_ex (ket=0x7f1e655c27f0 <sr_kemi_lcr_exports+144>, self=0x7f1e60ecd090, args=0x7f1e60dd07c0, idx=544) at apy_kemi.c:1354 #2 0x00007f1e65d90477 in sr_apy_kemi_exec_func (self=0x7f1e60ecd090, args=0x7f1e60dd07c0, idx=544) at apy_kemi.c:1829 #3 0x00007f1e65d9b6ff in sr_apy_kemi_exec_func_544 (self=0x7f1e60ecd090, args=0x7f1e60dd07c0) at apy_kemi_export.c:4395 #4 0x00007f1e658d4c74 in ?? () from /lib/x86_64-linux-gnu/libpython3.9.so.1.0 #5 0x00007f1e6588ea50 in _PyObject_MakeTpCall () from /lib/x86_64-linux-gnu/libpython3.9.so.1.0 #6 0x00007f1e658402f2 in _PyEval_EvalFrameDefault () from /lib/x86_64-linux-gnu/libpython3.9.so.1.0 #7 0x00007f1e65837033 in ?? () from /lib/x86_64-linux-gnu/libpython3.9.so.1.0 #8 0x00007f1e6583f4b7 in _PyEval_EvalFrameDefault () from /lib/x86_64-linux-gnu/libpython3.9.so.1.0 #9 0x00007f1e65837033 in ?? () from /lib/x86_64-linux-gnu/libpython3.9.so.1.0 #10 0x00007f1e6583f4b7 in _PyEval_EvalFrameDefault () from /lib/x86_64-linux-gnu/libpython3.9.so.1.0 #11 0x00007f1e65837033 in ?? () from /lib/x86_64-linux-gnu/libpython3.9.so.1.0 #12 0x00007f1e658916a4 in ?? () from /lib/x86_64-linux-gnu/libpython3.9.so.1.0 #13 0x00007f1e65da52fc in apy_exec (_msg=0x7f1e66521100, fname=0x7f1e65dae11d "ksr_request_route", fparam=0x0, emode=1) at python_exec.c:139 #14 0x00007f1e65d62cae in sr_kemi_config_engine_python (msg=0x7f1e66521100, rtype=1, rname=0x0, rparam=0x0) at apy_kemi.c:66 #15 0x000056247fc0a6e4 in sr_kemi_route (keng=0x562480066420 <_sr_kemi_eng_list>, msg=0x7f1e66521100, rtype=1, ename=0x0, edata=0x0) at core/kemi.c:3784 #16 0x000056247fc9da66 in receive_msg (buf=0x562480105280 <buf> "INVITE sip:0031686807515@34.91.122.173 SIP/2.0\r\nRecord-Route: sip:94.247.7.211;lr;ftag=tj0p4Q1r8H5ap\r\nVia: SIP/2.0/UDP 94.247.7.211;TH=div;branch=z9hG4bKdc26.e6a724746d6ff0bf5231906a5f1c8734.0\r\nVia:"..., len=1202, rcv_info=0x7ffe1f857090) at core/receive.c:502 #17 0x000056247fe01a5d in udp_rcv_loop () at core/udp_server.c:544 #18 0x000056247fb1a09b in main_loop () at main.c:1722 #19 0x000056247fb2720c in main (argc=10, argv=0x7ffe1f857ab8) at main.c:3078 (gdb) p lcr_count_param $1 = 1 (gdb) p lcr_id $2 = 3 ```