Prepare settings before execution with get or set functions.
    Removes settings with a match parameter when index is not found.

def _prepare_settings(pspath, settings):
    '''
    Prepare settings before execution with get or set functions.
    Removes settings with a match parameter when index is not found.
    '''
    prepared_settings = []
    for setting in settings:
        match = re.search(r'Collection\[(\{.*\})\]', setting['name'])
        if match:
            name = setting['name'][:match.start(1)-1]
            match_dict = yaml.load(match.group(1))
            index = _collection_match_to_index(pspath, setting['filter'], name, match_dict)
            if index != -1:
                setting['name'] = setting['name'].replace(match.group(1), str(index))
                prepared_settings.append(setting)
        else:
            prepared_settings.append(setting)
    return prepared_settings