Fix some warnings raised by CheckStyle

- Change ordering of 'static', 'final', etc modifiers according to
  the order suggested by JLS.

- Add comments in empty catch blocks for intentionally ignored
  exceptions.

- Add curly braces around if-else blocks.

- Move `catch` to same line as closing brace of preceding `try`
  blocks.

- Wrap long lines.

Note that this change does not fix all instances of the above errors
across the entire code base.

Change-Id: I24bb9649cc5013c249fa5d84e05322a5cdf2ace6

gerrit-server/src/main/java/com/google/gerrit/server/query/AndPredicate.java

@@ -92,8 +92,9 @@ public class AndPredicate<T> extends Predicate<T> {
 
   @Override
   public boolean equals(final Object other) {
-    if (other == null)
+    if (other == null) {
       return false;
+    }
     return getClass() == other.getClass()
         && getChildren().equals(((Predicate<?>) other).getChildren());
   }