アンテナ設定のユーザーが空なのを修正

[4ster1sk]

Fix: #644

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 27.69%. Comparing base (6955662) to head (cc1d3d6).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
lib/view/antenna_page/antenna_settings_dialog.dart	0.00%	3 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #664   +/-   ##
========================================
  Coverage    27.69%   27.69%           
========================================
  Files          312      312           
  Lines        16253    16253           
========================================
  Hits          4501     4501           
  Misses       11752    11752           

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[shiosyakeyakini-info]

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