Add null checks and fix CodeAnalysis errors.

I enabled code analysis to the Octokit.Reactive project and
needed to fix things up.

Octokit.Reactive/Clients/ObservableAuthorizationsClient.cs

@@ -28,11 +28,15 @@ namespace Octokit.Reactive.Clients
 
         public IObservable<Authorization> Update(long id, AuthorizationUpdate authorization)
         {
+            Ensure.ArgumentNotNull(authorization, "authorization");
+
             return client.Update(id, authorization).ToObservable();
         }
 
         public IObservable<Authorization> Create(AuthorizationUpdate authorization)
         {
+            Ensure.ArgumentNotNull(authorization, "authorization");
+
             return client.Create(authorization).ToObservable();
         }
 

Octokit.Reactive/Clients/ObservableOrganizationsClient.cs

@@ -17,6 +17,8 @@ namespace Octokit.Reactive.Clients
 
         public IObservable<Organization> Get(string org)
         {
+            Ensure.ArgumentNotNullOrEmptyString(org, "org");
+
             return client.Get(org).ToObservable();
         }
 
@@ -27,6 +29,8 @@ namespace Octokit.Reactive.Clients
 
         public IObservable<IReadOnlyCollection<Organization>> GetAll(string user)
         {
+            Ensure.ArgumentNotNullOrEmptyString(user, "user");
+
             return client.GetAll(user).ToObservable();
         }
     }

Octokit.Reactive/Clients/ObservableRepositoriesClient.cs

@@ -17,6 +17,9 @@ namespace Octokit.Reactive.Clients
 
         public IObservable<Repository> Get(string owner, string name)
         {
+            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
+            Ensure.ArgumentNotNullOrEmptyString(name, "name");
+
             return client.Get(owner, name).ToObservable();
         }
 
@@ -27,16 +30,23 @@ namespace Octokit.Reactive.Clients
 
         public IObservable<IReadOnlyCollection<Repository>> GetAllForUser(string login)
         {
+            Ensure.ArgumentNotNullOrEmptyString(login, "login");
+
             return client.GetAllForUser(login).ToObservable();
         }
 
         public IObservable<IReadOnlyCollection<Repository>> GetAllForOrg(string organization)
         {
+            Ensure.ArgumentNotNullOrEmptyString(organization, "organization");
+
             return client.GetAllForOrg(organization).ToObservable();
         }
 
         public IObservable<Readme> GetReadme(string owner, string name)
         {
+            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
+            Ensure.ArgumentNotNullOrEmptyString(name, "name");
+
             return client.GetReadme(owner, name).ToObservable();
         }
     }

Octokit.Reactive/Clients/ObservableSshKeysClient.cs

@@ -23,6 +23,8 @@ namespace Octokit.Reactive.Clients
 
         public IObservable<IReadOnlyCollection<SshKey>> GetAll(string user)
         {
+            Ensure.ArgumentNotNullOrEmptyString(user, "user");
+
             return client.GetAll(user).ToObservable();
         }
 
@@ -33,11 +35,15 @@ namespace Octokit.Reactive.Clients
 
         public IObservable<SshKey> Create(SshKeyUpdate key)
         {
+            Ensure.ArgumentNotNull(key, "key");
+
             return client.Create(key).ToObservable();
         }
 
         public IObservable<SshKey> Update(long id, SshKeyUpdate key)
         {
+            Ensure.ArgumentNotNull(key, "key");
+
             return client.Update(id, key).ToObservable();
         }
 

Octokit.Reactive/Clients/ObservableUsersClient.cs

@@ -16,6 +16,8 @@ namespace Octokit.Reactive.Clients
 
         public IObservable<User> Get(string login)
         {
+            Ensure.ArgumentNotNull(login, "login");
+
             return client.Get(login).ToObservable();
         }
 
@@ -26,6 +28,8 @@ namespace Octokit.Reactive.Clients
 
         public IObservable<User> Update(UserUpdate user)
         {
+            Ensure.ArgumentNotNull(user, "user");
+
             return client.Update(user).ToObservable();
         }
     }

Octokit.Reactive/ObservableExtensions.cs

@@ -10,6 +10,10 @@ namespace Octokit.Reactive
             string owner,
             string name)
         {
+            Ensure.ArgumentNotNull(client, "client");
+            Ensure.ArgumentNotNullOrEmptyString(owner, "owner");
+            Ensure.ArgumentNotNullOrEmptyString(name, "name");
+
             return client.GetReadme(owner, name).SelectMany(r => r.GetHtmlContent().ToObservable());
         }
     }

Octokit.Reactive/Octokit.Reactive.csproj

@@ -83,6 +83,11 @@
   <ItemGroup>
     <None Include="packages.config" />
   </ItemGroup>
+  <ItemGroup>
+    <CodeAnalysisDictionary Include="..\CustomDictionary.xml">
+      <Link>CustomDictionary.xml</Link>
+    </CodeAnalysisDictionary>
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.