### Description
Kamailio segfaults when KEMI functions are invoked from app_python script
### Troubleshooting
The same code was running ok with the 5.6 branch.
It seems that the function sr_apy_kemi_exec_func_ex has been re-written in 5.7
with the following main changes :
- The long IF/ELSE statement was replace by a FOR loop
- The call to PyArg_ParseTuple function was replaced by the call to
PyList_GetItem ==> **This seems to be the cause. The value returned by this
function is alway NULL**
#### Reproduction
Any call to KSR.pv.seti function from a PYTHON 2 script would cause this error.
#### Log Messages
```
sbin/kamailio[18449]: ERROR: app_python [apy_kemi.c:280]:
sr_apy_kemi_exec_func_ex(): null parameter - func: seti idx: 0 argc:
2
Feb 6 11:34:16 .../sbin/kamailio[18509]: CRITICAL: <core>
[core/pass_fd.c:281]: receive_fd(): EOF on 37
Feb 6 11:34:16 .../sbin/kamailio[18380]: ALERT: <core> [main.c:793]:
handle_sigs(): child process 18449 exited by a signal 11
Feb 6 11:34:16 .../sbin/kamailio[18380]: ALERT: <core> [main.c:796]:
handle_sigs(): core was not generated
Feb 6 11:34:16 .../sbin/kamailio[18380]: INFO: <core> [main.c:818]:
handle_sigs(): terminating due to SIGCHLD
Feb 6 11:34:16 .../sbin/kamailio[18509]: INFO: <core> [main.c:874]: sig_usr():
signal 15 received
Feb 6 11:34:16 .../sbin/kamailio[18502]: INFO: <core> [main.c:874]: sig_usr():
signal 15 received
Feb 6 11:34:16 .../sbin/kamailio[18495]: INFO: <core> [main.c:874]: sig_usr():
signal 15 received
Feb 6 11:34:16 .../sbin/kamailio[18482]: INFO: <core> [main.c:874]: sig_usr():
signal 15 received
```
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