dev/core#891 condition on id existenced when retrieving mailing hash #14114
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Overview
The presence of the mailing.viewUrl token with the mailing hash setting enabled expects the Mailing ID, which is not passed with the preview action (for performance reasons).
Before
With mailing hash enabled, the presence of the mailing.viewUrl token in a mailing would cause the mailing preview to hang and fail to open.
After
Preview opens as expected.
Technical Details
Same underlying issue as detailed in: #13956