MudCodeInput: Fix Crash when Initialize with Pre Defined Value

[mckaragoz]

Fix #625

[codecov]

Codecov Report

❌ Patch coverage is 17.39130% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.34%. Comparing base (533f2ff) to head (f4d7e8e).
⚠️ Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
...ensions/Components/CodeInput/MudCodeInput.razor.cs	28.57%	9 Missing and 1 partial ⚠️
...mponents/DateTimePicker/MudDateTimePicker.razor.cs	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #627      +/-   ##
==========================================
- Coverage   65.39%   65.34%   -0.06%     
==========================================
  Files         111      111              
  Lines        8341     8354      +13     
  Branches     1469     1474       +5     
==========================================
+ Hits         5455     5459       +4     
- Misses       2381     2389       +8     
- Partials      505      506       +1     

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