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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