[sr-dev] [kamailio/kamailio] presence: incorrect dialog state for multiple dialogs xml body (#1427)

[Vasiliy Ganchev]

my shame... I did not do NULL check and that was the reason for crash.
With your logging added (processing same body and input PUBLISH as before):

```
Feb 16 08:54:16 0050562c117c /usr/sbin/kamailio[30264]: ERROR: presence [presentity.c:361]: ps_match_dialog_state_from_body(): vstate is terminated, tmp_state is terminated
Feb 16 08:54:16 0050562c117c /usr/sbin/kamailio[30264]: ERROR: presence [presentity.c:388]: ps_match_dialog_state_from_body(): do entered 
Feb 16 08:54:16 0050562c117c /usr/sbin/kamailio[30264]: ERROR: presence [presentity.c:396]: ps_match_dialog_state_from_body(): compared [dialog] with [text]
Feb 16 08:54:16 0050562c117c /usr/sbin/kamailio[30264]: ERROR: presence [presentity.c:399]: ps_match_dialog_state_from_body(): node->next 
Feb 16 08:54:16 0050562c117c /usr/sbin/kamailio[30264]: ERROR: presence [presentity.c:388]: ps_match_dialog_state_from_body(): do entered 
Feb 16 08:54:16 0050562c117c /usr/sbin/kamailio[30264]: ERROR: presence [presentity.c:396]: ps_match_dialog_state_from_body(): compared [text] with [dialog]
Feb 16 08:54:16 0050562c117c /usr/sbin/kamailio[30264]: ERROR: presence [presentity.c:399]: ps_match_dialog_state_from_body(): node->next 
Feb 16 08:54:16 0050562c117c /usr/sbin/kamailio[30264]: ERROR: presence [presentity.c:388]: ps_match_dialog_state_from_body(): do entered 
Feb 16 08:54:16 0050562c117c /usr/sbin/kamailio[30264]: ERROR: presence [presentity.c:396]: ps_match_dialog_state_from_body(): compared [dialog] with [text]
Feb 16 08:54:16 0050562c117c /usr/sbin/kamailio[30264]: ERROR: presence [presentity.c:399]: ps_match_dialog_state_from_body(): node->next 
Feb 16 08:54:16 0050562c117c /usr/sbin/kamailio[30264]: ERROR: presence [presentity.c:388]: ps_match_dialog_state_from_body(): do entered 
Feb 16 08:54:16 0050562c117c /usr/sbin/kamailio[30264]: ERROR: presence [presentity.c:399]: ps_match_dialog_state_from_body(): node->next 
Feb 16 08:54:16 0050562c117c /usr/sbin/kamailio[30264]: ERROR: presence [presentity.c:406]: ps_match_dialog_state_from_body(): going to return rmatch 1
```

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