set tag value to null instead of empty string

IRCSharp.Tests/Tokenization/Data/msg-split.yaml

@@ -133,7 +133,7 @@ tests:
       tags:
         "a": "b"
         "c": "32"
-        "k": ""
+        "k":
         "rt": "ql7"
 
   # with escaped tags
@@ -149,7 +149,7 @@ tests:
   - input: "@c;h=;a=b :quux ab cd"
     atoms:
       tags:
-        "c": ""
+        "c":
         "h": ""
         "a": "b"
       source: "quux"
@@ -213,7 +213,7 @@ tests:
     atoms:
       tags:
         tag1: "value1"
-        tag2: ""
+        tag2:
         vendor1/tag3: "value2"
         vendor2/tag4: ""
       source: "irc.example.com"
@@ -236,9 +236,9 @@ tests:
     atoms:
       tags:
         tag1: "value1"
-        tag2: ""
+        tag2:
         vendor1/tag3: "value2"
-        vendor2/tag4: ""
+        vendor2/tag4:
       verb: "COMMAND"
       params:
         - "param1"

IRCSharp.Tests/Tokenization/Parser.cs

@@ -1,5 +1,4 @@
 using System.Globalization;
-using System.IO;
 using IRCSharp.Tests.Tokenization.Data;
 using YamlDotNet.Serialization;
 using YamlDotNet.Serialization.NamingConventions;

IRCSharp.Tests/Tokenization/Tokenization.cs

@@ -21,7 +21,7 @@ public class Tokenization
     public void TagsMissingEqual()
     {
         var line = new Line("@id PRIVMSG #channel");
-        Assert.AreEqual(string.Empty, line.Tags["id"]);
+        Assert.IsNull(line.Tags["id"]);
     }
 
     [TestMethod]

IRCStates/IRCStates.csproj

@@ -12,6 +12,7 @@
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <RepositoryUrl>https://tildegit.org/irctokens/ircsharp/src/branch/main/IRCStates</RepositoryUrl>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <EmbedUntrackedSources>true</EmbedUntrackedSources>
     <RepositoryType>git</RepositoryType>
     <PackageTags>irc</PackageTags>
     <PackageVersion>1.4.0</PackageVersion>

IRCTokens/IRCTokens.csproj

@@ -12,19 +12,20 @@
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <RepositoryUrl>https://tildegit.org/irctokens/ircsharp/src/branch/main/IRCTokens</RepositoryUrl>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <EmbedUntrackedSources>true</EmbedUntrackedSources>
     <RepositoryType>git</RepositoryType>
     <PackageTags>irc</PackageTags>
     <PackageVersion>1.4.0</PackageVersion>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <DebugType>embedded</DebugType>
   </PropertyGroup>
-  
+
   <ItemGroup>
-    <None Include="README.md" Pack="true" PackagePath="\" />
+    <None Include="README.md" Pack="true" PackagePath="\"/>
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.SourceLink.Gitea" Version="8.0.0" PrivateAssets="All"/>
+    <PackageReference Include="Microsoft.SourceLink.Gitea" Version="8.0.0" PrivateAssets="all"/>
   </ItemGroup>
 
 </Project>

IRCTokens/Line.cs

@@ -55,7 +55,7 @@ namespace IRCTokens
                     }
                     else
                     {
-                        Tags[part] = string.Empty;
+                        Tags[part] = null;
                     }
             }