Prevent a malformed file from crashing actor fetching

src/model/account.c

@@ -236,12 +236,17 @@ static struct account* account_load_from_id( int id, int recurse_limit )
 		return NULL;
 	}
 
+	// Handle account migration
 	if( a->replaced_by && a->replaced_by != a->id ) {
 		int new_id = a->replaced_by;
 		account_free(a);
 		return account_load_from_id( new_id, recurse_limit - 1 );
 	}
 
+	// Sanity checks
+	if( !a->note ) {
+		a->note = strdup("");
+	}
 	if( !a->banner ) {
 		a->banner = aformat( "https://%s/server/default-banner.blob", g_server->domain );
 	}