[maven-release-plugin] prepare release github-api-1.22

pom.xml

@@ -7,7 +7,7 @@
   </parent>
 
   <artifactId>github-api</artifactId>
-  <version>1.21</version>
+  <version>1.22</version>
   <name>GitHub API for Java</name>
   <url>http://github-api.kohsuke.org/</url>
   <description>GitHub API for Java</description>

src/main/java/org/kohsuke/github/GHRepository.java

@@ -156,6 +156,11 @@ public class GHRepository {
         return open_issues;
     }
 
+    /**
+     *
+     * @return
+     *      null if the repository was never pushed at.
+     */
     public Date getPushedAt() {
         return GitHub.parseDate(pushed_at);
     }

src/main/java/org/kohsuke/github/GitHub.java

@@ -489,6 +489,7 @@ public class GitHub {
     }
 
     /*package*/ static Date parseDate(String timestamp) {
+        if (timestamp==null)    return null;
         for (String f : TIME_FORMATS) {
             try {
                 SimpleDateFormat df = new SimpleDateFormat(f);

src/test/java/org/kohsuke/AppTest.java

@@ -44,6 +44,11 @@ public class AppTest extends TestCase {
         System.out.println(me);
         GHUser u = hub.getUser("kohsuke2");
         System.out.println(u);
+        for (List<GHRepository> lst : me.iterateRepositories(100)) {
+            for (GHRepository r : lst) {
+                System.out.println(r.getPushedAt());
+            }
+        }
     }
 
     public void tryOrgFork() throws Exception {