fixes #3

fix NullReference exception in NReadability.MetaExtractor

CHANGELOG.md

@@ -1,3 +1,7 @@
+### 4.2.1
+
+- fixes [issue #3](https://github.com/ceee/ReadSharp/issues/3)
+
 ### 4.2.0
 
 - use custom encoders if not supported on platform (implemented for ISO-8859 and Windows range).

PortablePorts/NReadability/MetaExtractor.cs

@@ -123,11 +123,14 @@ namespace ReadSharp.Ports.NReadability
           { "http-equiv|Content-Type", "content" }
         });
 
-        int charsetStart = result.IndexOf("charset=");
-        if (charsetStart > 0)
+        if (!String.IsNullOrEmpty(result))
         {
-          charsetStart += 8;
-          result = result.Substring(charsetStart, result.Length - charsetStart);
+          int charsetStart = result.IndexOf("charset=");
+          if (charsetStart > 0)
+          {
+            charsetStart += 8;
+            result = result.Substring(charsetStart, result.Length - charsetStart);
+          }
         }
       }
 

ReadSharp.Tests/ReadTests.cs

@@ -119,5 +119,15 @@ namespace ReadSharp.Tests
       Article result = await reader.Read(new Uri("http://www.uelike.com"));
       Assert.Equal(result.Title, expectedTitle);
     }
+
+    [Fact]
+    public async Task TestCriticalURIs()
+    {
+      Article result = await reader.Read(new Uri("http://www.jetbrains.com/resharper/whatsnew/index.html"));
+      Assert.NotEmpty(result.Content);
+
+      result = await reader.Read(new Uri("http://msdn.microsoft.com/en-us/library/windows/apps/hh464925.aspx"));
+      Assert.NotEmpty(result.Content);
+    }
   }
 }

ReadSharp/Properties/AssemblyInfo.cs

@@ -22,5 +22,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("4.2.0")]
-[assembly: AssemblyFileVersion("4.2.0")]
+[assembly: AssemblyVersion("4.2.1")]
+[assembly: AssemblyFileVersion("4.2.1")]