title: Unable to deploy maven to Github
body: <p>I'm having a bit of an issue when trying to do <code>mvn deploy</code></p>
  
  <p>The error I see is:</p>
  
  <pre><code>Expected data to be of type "object"; value was: nil.
  </code></pre>
  
  <p>For the github site plugin.</p>
  
  <p>This is the complete log:</p>
  
  <pre><code>[ERROR] 
  [ERROR] Expected data to be of type "object"; value was: nil.
  [ERROR] Expected data to be of type "object"; value was: nil. (422)
  [ERROR] -&gt; [Help 1]
  org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.github.github:site-maven-plugin:0.9:site (default) on project abc: Error creating commit: Invalid request.
  
  Expected data to be of type "object"; value was: nil.
  Expected data to be of type "object"; value was: nil. (422)
          at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:216)
          at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
          at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
          at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:108)
          at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:76)
          at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
          at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:116)
          at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:361)
          at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155)
          at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584)
          at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:213)
          at org.apache.maven.cli.MavenCli.main(MavenCli.java:157)
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:483)
          at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
          at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
          at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
          at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
  Caused by: org.apache.maven.plugin.MojoExecutionException: Error creating commit: Invalid request.
  
  Expected data to be of type "object"; value was: nil.
  Expected data to be of type "object"; value was: nil. (422)
          at com.github.maven.plugins.site.SiteMojo.execute(SiteMojo.java:440)
          at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:133)
          at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
          ... 19 more
  Caused by: org.eclipse.egit.github.core.client.RequestException: Invalid request.
  
  Expected data to be of type "object"; value was: nil.
  Expected data to be of type "object"; value was: nil. (422)
          at org.eclipse.egit.github.core.client.GitHubClient.createException(GitHubClient.java:552)
          at org.eclipse.egit.github.core.client.GitHubClient.sendJson(GitHubClient.java:643)
          at org.eclipse.egit.github.core.client.GitHubClient.post(GitHubClient.java:757)
          at org.eclipse.egit.github.core.service.DataService.createCommit(DataService.java:397)
          at com.github.maven.plugins.site.SiteMojo.execute(SiteMojo.java:434)
          ... 21 more
  [ERROR] 
  [ERROR] Re-run Maven using the -X switch to enable full debug logging.
  [ERROR] 
  [ERROR] For more information about the errors and possible solutions, please read the following articles:
  [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
  </code></pre>