Don't break if it tries to render ContextMenu without data. Fix #776

ui/src/common/ContextMenus.js

@@ -166,7 +166,8 @@ const ContextMenu = ({
   )
 }
 
-export const AlbumContextMenu = (props) => (
+export const AlbumContextMenu = (props) =>
+  props.record ? (
     <ContextMenu
       {...props}
       resource={'album'}
@@ -176,7 +177,7 @@ export const AlbumContextMenu = (props) => (
         filter: { album_id: props.record.id, disc_number: props.discNumber },
       }}
     />
-)
+  ) : null
 
 AlbumContextMenu.propTypes = {
   record: PropTypes.object,
@@ -190,7 +191,8 @@ AlbumContextMenu.defaultProps = {
   addLabel: true,
 }
 
-export const ArtistContextMenu = (props) => (
+export const ArtistContextMenu = (props) =>
+  props.record ? (
     <ContextMenu
       {...props}
       resource={'artist'}
@@ -200,7 +202,7 @@ export const ArtistContextMenu = (props) => (
         filter: { album_artist_id: props.record.id },
       }}
     />
-)
+  ) : null
 
 ArtistContextMenu.propTypes = {
   record: PropTypes.object,