hotfix/cp-12240-getsubscriptionid-hangs-without-subscription

[unnaticleverpush]

Prevent getSubscriptionId and CompletionFailureListener APIs from hanging indefinitely when autoRegister is false and the user never subscribes.

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Summary by cubic

Fixes hangs when there’s no subscription by returning null or invoking failure callbacks instead of waiting forever. Addresses Linear CP-12240 when autoRegister is false and the user never subscribes.

• Bug Fixes
  • CleverPush.getSubscriptionId(SubscribedListener) now calls the listener immediately with the current ID, queues only while initializing or subscribing, and returns null otherwise; setSubscriptionId notifies all queued listeners even when the value is null or empty.
  • All subscription-required APIs now fail fast with a clear error when there’s no subscription or the channel ID is missing: unsubscribe, stopCampaigns, add/remove/set topics, add/remove tags, remove attributes, tag tracking removal, set attributes, and mark/unmarkSubscriptionAsTest. Tag/attribute helpers also finish the operation after reporting failure.

^{Written for commit 4333757. Summary will update on new commits.}

[cubic-dev-ai]

All reported issues were addressed across 4 files

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