Fix missing return after handling suggestion error

[abdnh]

Related issues

https://github.com/ankipalace/ankihub_addon/pull/956

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[sentry-io[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ UnboundLocalError: local variable 'suggestion_result' referenced before assignment 1322529746.gui.suggestion_dialog in _on_suggest... View Issue

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