fix nonetype error

[sifte]

Description

fixes a nonetype error that is raised when the member/user doesn't have a profile picture

Fixes
nonetype error

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (Please specify):

Has this been tested:

• Yes
• No
• Not needed

Checklist:

If any are false, you may still submit, but may be asked to make changes.

• My code follows the style guidelines of this project

• I have changed/added the help doc at the beginning of any commands changed/added.

• I have performed a self-review of my own code

• I have commented my code, particularly in hard-to-understand areas

• My changed files do not include any files regularly changed in saves (something where my bot would interfere with this).

• My changes generate no new warnings

• I have tested and concluded that my changes are effective or that my feature works - If you have not tested, dont check this so I know to review it more. You may still make a PR for untested code.

• My code does not cause issues with existing code

• Any dependent changes have been merged and published in downstream modules

• Some of these options did not apply to my change (Please specify which):