get rid of unused import, add a comment

deepface/commons/package_utils.py

@@ -1,7 +1,6 @@
 # built-in dependencies
 import os
 import hashlib
-import platform
 
 # 3rd party dependencies
 import tensorflow as tf

deepface/modules/demography.py

@@ -96,7 +96,7 @@ def analyze(
                - 'white': Confidence score for White ethnicity.
     """
 
-    # validate actions
+    # if actions is passed as tuple with single item, interestingly it becomes str here
     if isinstance(actions, str):
         actions = (actions,)