Add Bybit TickerData empty value

[eliza-eliza]

Fix processing for Bybit TickerData empty value.

Pull request checklist

• Did you bump the project version?
• Did you add a description to the Pull Request?
• Did you add new tests?
• Did you add reviewers?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 2.30%. Comparing base (a295318) to head (a36070c).

Files with missing lines	Patch %	Lines
src/Bybit/Spot/API/Ticker.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master     #67      +/-   ##
=========================================
- Coverage    2.30%   2.30%   -0.01%     
=========================================
  Files         183     183              
  Lines        2256    2258       +2     
=========================================
  Hits           52      52              
- Misses       2204    2206       +2     

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