fix(Text Classifier Node): Default system prompt template #11018
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Summary
This PR addresses the issue with default system prompt template, and also validates that at least one category was specified in node parameters.
Related Linear tickets, Github issues, and Community forum posts
#10336
https://linear.app/n8n/issue/AI-274/community-issue-text-classifier-node-complains-when-system-prompt
Review / Merge checklist
release/backport
(if the PR is an urgent fix that needs to be backported)