ISTWCMS-6544 Expand/collapse block editing should handle cases where the referenced node has been deleted

Lily Yanrequested to merge
feature/ISTWCMS-6544-ec-block-editing-should-handle-cases-where-referenced-node-deleted into 1.1.x

ISTWCMS-6544 Expand/collapse block editing should handle cases where the referenced node has been deleted

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