Revert "Fix non-matching defaults in docs (#5446) (#5451)"

This reverts commit b26df2a008.

plugins/modules/cloud/pubnub/pubnub_blocks.py

@@ -37,7 +37,6 @@ options:
       same play)."
     required: false
     type: str
-    default: ''
   password:
     description:
       - Password which match to account to which specified C(email) belong.
@@ -45,7 +44,6 @@ options:
       same play)."
     required: false
     type: str
-    default: ''
   cache:
     description: >
        In case if single play use blocks management module few times it is
@@ -60,7 +58,7 @@ options:
       manage blocks."
       - "User's account will be used if value not set or empty."
     type: str
-    default: ''
+    required: false
   application:
     description:
       - "Name of target PubNub application for which blocks configuration on