
currently an invalid collection will error out on docs sanity, but this is misleading since the problem is that the collection name itself is invalid, a previous test verifying this should be introduced to avoid confusion.

example currently:
```
Running sanity test 'ansible-doc' with Python 3.7
ERROR: Command "ansible-doc -t module cyberark.ansible-security-automation-collection.cyberark_account cyberark.ansible-security-automation-collection.cyberark_authentication cyberark.ansible-security-automation-collection.cyberark_credential cyberark.ansible-security-automation-collection.cyberark_user" returned exit status 250.
>>> Standard Error
[WARNING]: module cyberark.ansible-security-automation-collection.cyberark_account not found in: /dev/null:/home/abehl/work/src/anshul_ansible/ansible/lib/ansible/modules
ERROR! Unexpected Exception, this is probably a bug: cannot unpack non-iterable NoneType object
```
##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
ansible-test

"""Internal implementation for displaying a warning message."""
        self.print_message('WARNING: %s' % message, color=self.purple, fd=sys.stderr)
    def review_warnings(self):  
        """Review all warnings which previously occurred."""
        if not self.warnings:
            return
        self.__warning('Reviewing previous %d warning(s):' % len(self.warnings))
        for warning in self.warnings:
            self.__warning(warning)
    def warning(self, message, unique=False, verbosity=0):  
        """Display a warning level message."""
        if verbosity > self.verbosity:
            return
        if unique:
            if message in self.warnings_unique:
                return
            self.warnings_unique.add(message)
        self.__warning(message)
        self.warnings.append(message)
    def notice(self, message):  
        """Display a notice level message."""
        self.print_message('NOTICE: %s' % message, color=self.purple, fd=sys.stderr)
    def error(self, message):  
        """Display an error level message."""
        self.print_message('ERROR: %s' % message, color=self.red, fd=sys.stderr)
    def info(self, message, verbosity=0, truncate=False):