fix: fix jwt expiry check

(cherry picked from commit d71e279)

When upgrading ACA-Py and using old JWTs that did not contain the expiry
information, is becomes no longer possible to use those JWTs at all.
Since the JWT cannot be modified by the end user, I see no point in
rejecting all JWTs that do not contain expiry information.

Signed-off-by: Colton Wolkins (Indicio work address) <colton@indicio.tech>

aries_cloudagent/multitenant/base.py

@@ -353,7 +353,7 @@ async def get_profile_for_token(
 
             extra_settings["wallet.key"] = wallet_key
 
-        if wallet.jwt_iat and wallet.jwt_iat != iat:
+        if wallet.jwt_iat and iat is not None and wallet.jwt_iat != iat:
             raise MultitenantManagerError("Token not valid")
 
         profile = await self.get_wallet_profile(context, wallet, extra_settings)