String concatenation tolerates null strings

[jbnx42]

It might be worth a quick mention that the string concatenation operator will tolerate a null string for either operand and will treat it as an empty string.

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• ID: 7e31f06e-936e-d0c7-9dc0-9d10fd8a0dd9
• Version Independent ID: 43899711-a922-8180-25e6-d52af245846d
• Content: + and += operators - C# reference
• Content Source: docs/csharp/language-reference/operators/addition-operator.md
• Product: dotnet-csharp
• Technology: csharp-language-reference
• GitHub Login: @BillWagner
• Microsoft Alias: wiwagn

[pkulikov]

@BillWagner could you please assign this to me