Ensure lists with no entities populate pagination section correctly

[richard-cox]

• ids: { } => ids: { 1: [] }
• think this is a regression following the removal of partial entities
• Fixes Delete Application shows empty page #2682, Pagination request: Validation doesn't insert correct value into store #2684

[cfdreddbot]

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[codecov]

Codecov Report

Merging #2685 into v2-master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           v2-master   #2685   +/-   ##
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  Coverage       69.9%   69.9%           
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  Files            598     598           
  Lines          25408   25408           
  Branches        5750    5750           
=========================================
  Hits           17761   17761           
  Misses          7647    7647