Handle redaction with no sender

src/components/views/messages/UnknownBody.js

@@ -25,9 +25,10 @@ module.exports = React.createClass({
     render: function() {
         let tooltip = _t("Removed or unknown message type");
         if (this.props.mxEvent.isRedacted()) {
-            tooltip = _t("Message removed by %(userId)s", {
+            const redactedBecauseUserId = this.props.mxEvent.getUnsigned().redacted_because.sender;
-                userId: this.props.mxEvent.getUnsigned().redacted_because.sender,
+            tooltip = redactedBecauseUserId ?
-            });
+                _t("Message removed by %(userId)s", { userId: redactedBecauseUserId }) :
+                _t("Message removed");
         }
 
         const text = this.props.mxEvent.getContent().body;

src/i18n/strings/en_EN.json

@@ -200,8 +200,6 @@
     "Authentication": "Authentication",
     "Failed to delete device": "Failed to delete device",
     "Delete": "Delete",
-    "Delete Widget": "Delete Widget",
-    "Deleting a widget removes it for all users in this room. Are you sure you want to delete this widget?": "Deleting a widget removes it for all users in this room. Are you sure you want to delete this widget?",
     "Disable Notifications": "Disable Notifications",
     "Enable Notifications": "Enable Notifications",
     "Cannot add any more widgets": "Cannot add any more widgets",
@@ -452,6 +450,7 @@
     "You are about to be taken to a third-party site so you can authenticate your account for use with %(integrationsUrl)s. Do you wish to continue?": "You are about to be taken to a third-party site so you can authenticate your account for use with %(integrationsUrl)s. Do you wish to continue?",
     "Removed or unknown message type": "Removed or unknown message type",
     "Message removed by %(userId)s": "Message removed by %(userId)s",
+    "Message removed": "Message removed",
     "Robot check is currently unavailable on desktop - please use a <a>web browser</a>": "Robot check is currently unavailable on desktop - please use a <a>web browser</a>",
     "This Home Server would like to make sure you are not a robot": "This Home Server would like to make sure you are not a robot",
     "Sign in with CAS": "Sign in with CAS",
@@ -499,6 +498,8 @@
     "NOTE: Apps are not end-to-end encrypted": "NOTE: Apps are not end-to-end encrypted",
     "Do you want to load widget from URL:": "Do you want to load widget from URL:",
     "Allow": "Allow",
+    "Delete Widget": "Delete Widget",
+    "Deleting a widget removes it for all users in this room. Are you sure you want to delete this widget?": "Deleting a widget removes it for all users in this room. Are you sure you want to delete this widget?",
     "Delete widget": "Delete widget",
     "Revoke widget access": "Revoke widget access",
     "Edit": "Edit",
@@ -678,17 +679,17 @@
     "Leave %(groupName)s?": "Leave %(groupName)s?",
     "Leave": "Leave",
     "Unable to leave room": "Unable to leave room",
+    "Community Settings": "Community Settings",
     "Add rooms to this community": "Add rooms to this community",
     "Featured Rooms:": "Featured Rooms:",
     "Featured Users:": "Featured Users:",
     "%(inviter)s has invited you to join this community": "%(inviter)s has invited you to join this community",
-    "You are a member of this community": "You are a member of this community",
     "You are an administrator of this community": "You are an administrator of this community",
+    "You are a member of this community": "You are a member of this community",
     "Community Member Settings": "Community Member Settings",
     "Publish this community on your profile": "Publish this community on your profile",
     "Long Description (HTML)": "Long Description (HTML)",
     "Description": "Description",
-    "Community Settings": "Community Settings",
     "Community %(groupId)s not found": "Community %(groupId)s not found",
     "This Home server does not support communities": "This Home server does not support communities",
     "Failed to load %(groupId)s": "Failed to load %(groupId)s",