Fix build failure due to Java 7 specific statement usage

6ecab77d02 was cherry-picked from
master and causes a build failure because it uses a multi-catch
statement that is not supported in source version 1.6.  On master
the Java source version is 1.7 which is why it builds there.

Change-Id: Ia43c2c6b9068553635a5ddd5bc4129ddf5c1fd35

gerrit-server/src/main/java/com/google/gerrit/server/project/GetHead.java

@@ -63,11 +63,15 @@ public class GetHead implements RestReadView<ProjectResource> {
             return head.getObjectId().name();
           }
           throw new AuthException();
-        } catch (MissingObjectException | IncorrectObjectTypeException e) {
+        } catch (MissingObjectException e) {
           if (rsrc.getControl().isOwner()) {
             return head.getObjectId().name();
           }
           throw new AuthException();
+        } catch (IncorrectObjectTypeException e) {
+          if (rsrc.getControl().isOwner()) {
+            return head.getObjectId().name();
+          }
         } finally {
           rw.release();
         }