Fix issue jenkinsci#232 due to changes in underlying api

src/main/java/org/jenkinsci/plugins/ghprb/GhprbRepository.java

@@ -76,7 +76,7 @@ public void check() {
         if (!initGhRepository()) {
             return;
         }
-        
+
         if (helper.isProjectDisabled()) {
             logger.log(Level.FINE, "Project is disabled, not checking github state");
             return;
@@ -144,16 +144,12 @@ public void createCommitStatus(AbstractBuild<?, ?> build, String sha1, GHCommitS
             } else {
                 ghRepository.createCommitStatus(sha1, state, url, message);
             }
-        } catch (FileNotFoundException ex) {
-            newMessage = "FileNotFoundException means that the credentials Jenkins is using is probably wrong. Or that something is really wrong with github.";
-            if (stream != null) {
-                stream.println(newMessage);
-                ex.printStackTrace(stream);
+        } catch (IOException ex) {
+            if (ex instanceof FileNotFoundException) {
+              newMessage = "FileNotFoundException means that the credentials Jenkins is using is probably wrong. Or the user account does not have write access to the repo.";
             } else {
-                logger.log(Level.INFO, newMessage, ex);
+              newMessage = "Could not update commit status of the Pull Request on GitHub.";
             }
-        } catch (IOException ex) {
-            newMessage = "Could not update commit status of the Pull Request on GitHub.";
             if (stream != null) {
                 stream.println(newMessage);
                 ex.printStackTrace(stream);