Allow empty inviteeAci field when importing GroupInvitationDeclinedUpdate update messages

ts/components/conversation/GroupV2Change.stories.tsx

@@ -1094,7 +1094,6 @@ export function PendingRemoveOne(): JSX.Element {
           },
         ],
       })}
-
       {renderChange({
         from: CONTACT_B,
         details: [
@@ -1115,7 +1114,6 @@ export function PendingRemoveOne(): JSX.Element {
           },
         ],
       })}
-
       {renderChange({
         from: CONTACT_C,
         details: [
@@ -1145,7 +1143,6 @@ export function PendingRemoveOne(): JSX.Element {
           },
         ],
       })}
-
       {renderChange({
         from: OUR_ACI,
         details: [
@@ -1172,6 +1169,23 @@ export function PendingRemoveOne(): JSX.Element {
           },
         ],
       })}
+      no from field or invitee
+      {renderChange({
+        details: [
+          {
+            type: 'pending-remove-one',
+            inviter: OUR_ACI,
+          },
+        ],
+      })}
+      no from field, invitee, or inviter
+      {renderChange({
+        details: [
+          {
+            type: 'pending-remove-one',
+          },
+        ],
+      })}
     </>
   );
 }

ts/groupChange.ts

@@ -561,6 +561,10 @@ function renderChangeDetail<T extends string | JSX.Element>(
     const sentByInvited = Boolean(from && from === serviceId);
     const sentByInviter = Boolean(from && inviter && from === inviter);
 
+    if (!serviceId) {
+      return i18n('icu:GroupV2--pending-remove--decline--unknown');
+    }
+
     if (weAreInviter) {
       if (sentByInvited) {
         return i18n('icu:GroupV2--pending-remove--decline--you', {

ts/groups.ts

@@ -200,7 +200,7 @@ type GroupV2PendingAddManyChangeType = {
 // Note: pending-remove is only used if user didn't also join the group at the same time
 type GroupV2PendingRemoveOneChangeType = {
   type: 'pending-remove-one';
-  serviceId: ServiceIdString;
+  serviceId?: ServiceIdString;
   inviter?: AciString;
 };
 // Note: pending-remove is only used if user didn't also join the group at the same time

ts/services/backups/import.ts

@@ -2969,12 +2969,9 @@ export class BackupImportStream extends Writable {
       }
       if (update.groupInvitationDeclinedUpdate) {
         const { inviterAci, inviteeAci } = update.groupInvitationDeclinedUpdate;
-        if (!inviteeAci || Bytes.isEmpty(inviteeAci)) {
-          throw new Error(
-            `${logId}: groupInvitationDeclinedUpdate had missing inviteeAci!`
-          );
-        }
-        from = fromAciObject(Aci.fromUuidBytes(inviteeAci));
+        from = Bytes.isNotEmpty(inviteeAci)
+          ? fromAciObject(Aci.fromUuidBytes(inviteeAci))
+          : undefined;
         details.push({
           type: 'pending-remove-one',
           inviter: Bytes.isNotEmpty(inviterAci)