Fix frontend prompt user to save nickname

[IscoRuta98]

Aim of this PR is to fix the following issue: Make sure a user cannot save an empty wallet nickname. They can chose to cancel, and this won't cause duplication in the quick access component.

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[codecov-commenter]

Codecov Report

Merging #555 (c418f90) into main (68d47cf) will decrease coverage by 0.92%. The diff coverage is 14.28%.

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@@            Coverage Diff             @@
##             main     #555      +/-   ##
==========================================
- Coverage   47.12%   46.20%   -0.92%     
==========================================
  Files         173      173              
  Lines        2814     2820       +6     
  Branches      539      541       +2     
==========================================
- Hits         1326     1303      -23     
- Misses       1488     1517      +29     

Impacted Files	Coverage Δ
...b-client/src/app/state/qAccess/q-access.service.ts	26.31% <14.28%> (-1.14%)	:arrow_down:

... and 2 files with indirect coverage changes