Fix Null Refs with ImageUrl

Booru.Net.Tests/Booru.Net.Tests.csproj

@@ -3,8 +3,8 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp2.1</TargetFramework>
-    <AssemblyVersion>2020.3.24.0</AssemblyVersion>
-    <FileVersion>2020.3.24.0</FileVersion>
+    <AssemblyVersion>2020.3.25.0</AssemblyVersion>
+    <FileVersion>2020.3.25.0</FileVersion>
   </PropertyGroup>
 
   <ItemGroup>

Booru.Net.Tests/Program.cs

@@ -56,7 +56,7 @@ namespace Booru.Net.Tests
 
                 if (posts != null)
                 {
-                    Console.WriteLine(posts.All(x => x != null));
+                    Console.WriteLine(posts.All(x => x.ImageUrl != null));
                 }
             }
             catch(Exception ex)

Booru.Net/Booru.Net.csproj

@@ -24,10 +24,10 @@ Yande.re</Description>
     <PackageTags>booru imageboard api wrapper</PackageTags>
     <PackageLicenseUrl></PackageLicenseUrl>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
-    <Version>2.0.2</Version>
+    <Version>2.0.3</Version>
     <PackageLicenseFile>LICENSE</PackageLicenseFile>
-    <AssemblyVersion>2.0.2.0</AssemblyVersion>
-    <FileVersion>2.0.2.0</FileVersion>
+    <AssemblyVersion>2.0.3.0</AssemblyVersion>
+    <FileVersion>2.0.3.0</FileVersion>
     <PackageReleaseNotes>Readded DanBooruImage#Score from Inheritence Rework</PackageReleaseNotes>
   </PropertyGroup>
 

Booru.Net/Models/Boards/DanBooruImage.cs

@@ -8,6 +8,12 @@ namespace Booru.Net
 		[JsonProperty("score")]
 		public int? Score { get; set; }
 
+		[JsonProperty("file_url")]
+		private string FileUrl { get; set; }
+
+		public override string ImageUrl
+			=> FileUrl;
+
 		[JsonProperty("tag_string")]
 		private string TagString { get; set; }
 

Booru.Net/Models/Boards/GelbooruImage.cs

@@ -11,6 +11,12 @@ namespace Booru.Net
 		[JsonProperty("directory")]
 		public string Directory { get; set; }
 
+		[JsonProperty("file_url")]
+		private string FileUrl { get; set; }
+
+		public override string ImageUrl
+			=> FileUrl;
+
 		[JsonProperty("tags")]
 		private string Ptags { get; set; }
 

Booru.Net/Models/BooruImage.cs

@@ -10,9 +10,9 @@ namespace Booru.Net
 		[JsonProperty("rating")]
 		private string Prating { get; set; }
 
-        public virtual string ImageUrl { get; set; }
+        public virtual string ImageUrl { get; private set; }
 
-        public virtual string PostUrl { get; set; }
+        public virtual string PostUrl { get; private set; }
 
 		public Rating Rating
 		{