audio_settings crashes if none of the element indexes (sources, sinks) is marked as active

On a system here (Dell Inspiron 17R), audio_settings is bombing with this trace:

Traceback (most recent call last):
  File "/usr/share/checkbox/scripts/audio_settings", line 241, in <module>
    sys.exit(main())
  File "/usr/share/checkbox/scripts/audio_settings", line 218, in main
    store_audio_settings(args.file)
  File "/usr/share/checkbox/scripts/audio_settings", line 92, in store_audio_settings
    active_entry = active_entries_regex.search(pacmd_entries).group()
AttributeError: 'NoneType' object has no attribute 'group'

I went in and was able to replicate this behavior by simply running:
/usr/share/checkbox/scripts/audio_settings store --file=/tmp/something

I traced this to trying to find a line like this in pactl list-sources output:

* index: 0

This is given by a regular expression defined as follows:
active_entries_regex = re.compile("\* index.*?(?=properties)", re.DOTALL)

The important part is the asterisk. On a system where the test doesn't bomb, pacmd list-sources |grep index says this:

    index: 0
  * index: 1

However on the failing system it's this:

    index: 0
    index: 1

Apparently the line where the regex search is performed assumes that it will always succeed, instead of checking that it had a match (line 91 in the script):

active_entry = active_entries_regex.search(pacmd_entries).group()

I'm attaching in its entirety the pacmd output that gives trouble, maybe the parsing can be fixed to accomodate this.