blob detector npe fix, other detectors fix 404 scenario

[EugeneDrpc]

No description provided.

[Copilot]

Pull request overview

This pull request fixes null pointer exceptions and improves 404 error detection across beacon chain lower bound detectors.

Changes:

• Fixed NPE in blob detector when handling null or empty data nodes
• Improved 404 error code detection to handle both numeric (404) and text ("404") code formats across all detectors
• Enhanced null-safety by storing node references before accessing their properties

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
BeaconChainLowerBoundStateDetector.kt	Updated 404 detection logic to handle both numeric and text code formats, preventing NPE when code is numeric
BeaconChainLowerBoundEpochDetector.kt	Updated 404 detection logic to handle both numeric and text code formats, preventing NPE when code is numeric
BeaconChainLowerBoundBlockDetector.kt	Updated 404 detection logic to handle both numeric and text code formats, preventing NPE when code is numeric
BeaconChainLowerBoundBlobDetector.kt	Fixed NPE when data node is null and improved 404 detection to handle both numeric and text code formats

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