[Blocker] fix: change null check to empty string for affiliateCode filter
Published on February 7, 2026
## GitHub Update
**Repository:** [MKWcorp/drwprime](https://github.com/MKWcorp/drwprime)
**Author:** MKWcorp
**Date:** 2/7/2026, 11:26:49 AM
**Commit:** [`d16487c`](https://github.com/MKWcorp/drwprime/commit/d16487cf39a0539b7a24220cfb6f05d7383f4ce9)
### Commit Message
fix: change null check to empty string for affiliateCode filter
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