Sorting on number field in Advanced Roadmaps sorts empty entries differently than Advanced Issue Search

Issue Summary

Sorting on number field in Advanced Roadmaps sorts empty entries differently than Advanced Issue Search. In Advanced Roadmaps, empty entries on the number field will sort at the top when sort by ascending on the number field. In Advanced Issue Search, it will sort empty entries below the entries with entries int he number field when sort by ascending.

Customer would like Advanced Roadmaps to sort like Advanced issue search, with empty entries falling below entries that are filled when sort by ascending.

Steps to Reproduce

1. Insert a number field into your roadmap. Number a few entries on your issues while other entries are left blank
2. Sort Ascending on the number field in your roadmap

Expected Results

The blank entries sort beneath the filled entries, matching Advanced Issue Search's sorting style

Actual Results

The blank entries sort above the filled entries, the opposite of Advanced Issue Search's sorting style

Workaround

Fill all values for the number field in issues on the board