ims_qos: check and log for NULL sessionId

[smititelu]

Pre-Submission Checklist

• Commit message has the format required by CONTRIBUTING guide
• Commits are split per component (core, individual modules, libs, utils, ...)
• Each component has a single commit (if not, squash them into one commit)
• No commits to README files for modules (changes must be done to docbook files
  in doc/ subfolder, the README file is autogenerated)

Type Of Change

• Small bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new functionality)
• Breaking change (fix or feature that would change existing functionality)

Checklist:

• PR should be backported to stable branches
• Tested changes locally
• Related to issue #XXXX (replace XXXX with an open issue number)

Description

Check for NULL sessionId from PCRF, which can lead to kamailio crash.

[miconda]

Thanks!

[smititelu]

can I backport this to 5.7 and 5.6?

[henningw]

It is a bugfix, sure. Small note regarding future patches, its actually not necessary to include the function name prefix in the log message, it should be added automatically from the LM_ERR etc.. macros.

[smititelu]

OK, thank you.