remove tray/catch due to changed method signature (after rebase)

src/generic/java/com/owncloud/android/utils/PushUtils.java

@@ -1,4 +1,4 @@
-/**
+/*
  * Nextcloud Android client application
  *
  * @author Mario Danic

src/gplay/java/com/owncloud/android/utils/PushUtils.java

@@ -55,7 +55,6 @@ import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
-import java.io.IOException;
 import java.security.InvalidKeyException;
 import java.security.Key;
 import java.security.KeyFactory;