[Glitch] Fix error on viewing a profile when unlogged

Port 1c041356a1 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/account/components/header.jsx

@@ -74,6 +74,8 @@ const titleFromAccount = account => {
 };
 
 const messageForFollowButton = relationship => {
+  if(!relationship) return messages.follow;
+
   if (relationship.get('following') && relationship.get('followed_by')) {
     return messages.mutual;
   } else if (!relationship.get('following') && relationship.get('followed_by')) {