Remove declaration of exceptions that are never thrown

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: Iaa53ce323b1b6076aa9537d773f792d51a9afc0e

java/com/google/gerrit/server/mail/receive/MailProcessor.java

@@ -420,7 +420,7 @@ public class MailProcessor {
 
     private HumanComment persistentCommentFromMailComment(
         ChangeContext ctx, MailComment mailComment, PatchSet patchSetForComment)
-        throws UnprocessableEntityException, PatchListNotAvailableException {
+        throws PatchListNotAvailableException {
       String fileName;
       // The patch set that this comment is based on is different if this
       // comment was sent in reply to a comment on a previous patch set.

java/com/google/gerrit/server/restapi/change/PostReview.java

@@ -940,8 +940,7 @@ public class PostReview implements RestModifyView<RevisionResource, ReviewInput>
     }
 
     private boolean insertComments(ChangeContext ctx, List<RobotComment> newRobotComments)
-        throws UnprocessableEntityException, PatchListNotAvailableException,
-            CommentsRejectedException {
+        throws PatchListNotAvailableException, CommentsRejectedException {
       Map<String, List<CommentInput>> inputComments = in.comments;
       if (inputComments == null) {
         inputComments = Collections.emptyMap();

java/com/google/gerrit/server/restapi/change/ReplyAttentionSetUpdates.java

@@ -133,8 +133,7 @@ public class ReplyAttentionSetUpdates {
   }
 
   private ImmutableSet<HumanComment> getAllNewComments(
-      ChangeNotes changeNotes, ReviewInput input, CurrentUser currentUser)
-      throws UnprocessableEntityException {
+      ChangeNotes changeNotes, ReviewInput input, CurrentUser currentUser) {
     Set<HumanComment> newComments = new HashSet<>();
     if (input.comments != null) {
       for (ReviewInput.CommentInput commentInput :