[chassis][supervisor] show system-health summary fails on the supervisor card

[mlok-nokia]

Why I did it

Fix the command "sudo show system-health summary" shows the following error on the supervisor card. Fixes #10630

How I did it

This issue is caused by the function get_critical_process_list_from_file() that is not able to handle the empty line in the file critical_processes. On supervisor card, the critical_processes file under swss which is derived from the critical_processes.j2 file and contains empty lines. Added code the check the the re.match result is None, don't continue to process it

How to verify it

1. boot the image on supervisor card, issue command "sudo show system-health summary". The output should be shown as below:

admin@supervisor:~$ sudo show system-health summary 
System status summary

  System status LED  green
  Services:
    Status: OK
  Hardware:
    Status: OK

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205

Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: mlok-nokia / name: Marty Y. Lok (f706420f07c97b21930ee448fb0cbfdccfd81ed1)

[mlok-nokia]

@judyjoseph @prgeor @abdosi Please help to review at this PR. It is applicable to 202205 branch also. Thanks.