AbstractIcon: Null Protection for ImageIcons and Separating Dialogs out from the Choosers beneath

[Windchild292]

This is the MHQ-side of MegaMek/megamek#2509 , and MUST be merged at the same time.

[codecov]

Codecov Report

Merging #2285 (57947db) into master (03ffd7d) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##             master   #2285   +/-   ##
========================================
  Coverage      8.28%   8.28%           
  Complexity     2587    2587           
========================================
  Files           673     673           
  Lines         95085   95085           
  Branches      15983   15983           
========================================
  Hits           7876    7876           
  Misses        86142   86142           
  Partials       1067    1067           

Impacted Files	Coverage Δ	Complexity Δ
.../mekhq/gui/adapter/PersonnelTableMouseAdapter.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
MekHQ/src/mekhq/gui/dialog/NewRecruitDialog.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)

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