appease the compiler

Author: Elektryk-Andrzej

SER.csproj

@@ -19,15 +19,15 @@
         <DebugSymbols>true</DebugSymbols>
         <DebugType>embedded</DebugType>
         <Optimize>false</Optimize>
-        <DefineConstants>DEBUG;TRACE</DefineConstants>
+        <DefineConstants>DEBUG;TRACE;HAVE_NULLABLE_ATTRIBUTES</DefineConstants>
         <OutputPath>bin\Debug\</OutputPath>
         <WarningLevel>4</WarningLevel>
     </PropertyGroup>
 
     <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
         <DebugType>full</DebugType>
         <Optimize>true</Optimize>
-        <DefineConstants>TRACE</DefineConstants>
+        <DefineConstants>TRACE;HAVE_NULLABLE_ATTRIBUTES</DefineConstants>
         <OutputPath>bin\Release\</OutputPath>
         <WarningLevel>4</WarningLevel>
     </PropertyGroup>