Adapt to enabling error level for the EmptyCatch bug pattern in Gerrit core

Fix the current issues so that the build continues to work.

Bug: Issue 15061
Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: Ibc39c9b479e0c0c5e6e1da9a0ca6bbb11744e1d8

src/test/java/com/googlesource/gerrit/plugins/replication/ForwardingProxy.java

diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/ForwardingProxy.java b/src/test/java/com/googlesource/gerrit/plugins/replication/ForwardingProxy.java
index a1f61fe..5e6bde8 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/ForwardingProxy.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/ForwardingProxy.java
@@ -65,6 +65,7 @@
           return implementedByOverrider;
         }
       } catch (NoSuchMethodException | SecurityException e) {
+        return null;
       }
       return null;
     }