refactor node refresh and properties expansion method signatures

Remove the exception declaration from methods where it is not needed so
that the methods higher up in the hierarchy can be relieved of the need
to catch and handle these errors.

Change-Id: Ic579be39c2eb04e53d76bea2aaf7a212b8164d41

src/main/java/com/googlesource/gerrit/plugins/task/TaskTree.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/task/TaskTree.java b/src/main/java/com/googlesource/gerrit/plugins/task/TaskTree.java
index 501e9db..98170f7 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/task/TaskTree.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/task/TaskTree.java
@@ -229,7 +229,7 @@
   public class Node extends NodeList {
     public class Invalid extends Node {
       @Override
-      public void refreshTask() throws ConfigInvalidException, StorageException {}
+      public void refreshTask() {}
 
       @Override
       public Task getDefinition() {
@@ -305,7 +305,7 @@
     /* The task needs to be refreshed before a node is used, however
     subNode refreshing can wait until they are fetched since they may
     not be needed. */
-    public void refreshTask() throws ConfigInvalidException, StorageException {
+    public void refreshTask() {
       this.path = new LinkedList<>(parent.path);
       String key = key();
       isDuplicate = path.contains(key);
@@ -647,8 +647,7 @@
     return statistics;
   }
 
-  protected static List<Node> refresh(List<Node> nodes)
-      throws ConfigInvalidException, StorageException {
+  protected static List<Node> refresh(List<Node> nodes) {
     for (Node node : nodes) {
       node.refreshTask();
     }

src/main/java/com/googlesource/gerrit/plugins/task/properties/Properties.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/task/properties/Properties.java b/src/main/java/com/googlesource/gerrit/plugins/task/properties/Properties.java
index 9f82dba..591773a 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/task/properties/Properties.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/task/properties/Properties.java
@@ -15,7 +15,6 @@
 package com.googlesource.gerrit.plugins.task.properties;
 
 import com.google.common.collect.ImmutableSet;
-import com.google.gerrit.exceptions.StorageException;
 import com.google.gerrit.server.query.change.ChangeData;
 import com.googlesource.gerrit.plugins.task.TaskConfig;
 import com.googlesource.gerrit.plugins.task.TaskConfig.NamesFactory;
@@ -85,7 +84,7 @@
 
   /** Use to expand properties specifically for Tasks. */
   @SuppressWarnings("try")
-  public Task getTask(ChangeData changeData) throws StorageException {
+  public Task getTask(ChangeData changeData) {
     try (StopWatch stopWatch =
         StopWatch.builder()
             .enabled(statistics != null)