Fix image policy & silence warnings

sites/+components/page-head.php

@@ -4,7 +4,7 @@
 <meta 
     http-equiv="Content-Security-Policy" 
     content="
-        script-src 'self'; img-src 'self'; connect-src 'self'; font-src 'none';
+        script-src 'self'; img-src 'self' data:; connect-src 'self'; font-src 'none';
         object-src 'none'; media-src 'none'; form-action 'none'; base-uri 'self';
     "
 >

sites/+components/tbl_communities.php

@@ -53,10 +53,11 @@
 		$hostname = explode("/", $hostname)[0];
 
 		// Escape external input.
+		// Ternaries prevent passing null-equal strings, which produce warnings.
 		$id = htmlspecialchars($id);
-		$language = htmlspecialchars($room->language);
+		$language = $room->language ? htmlspecialchars($room->language) : "";
 		$name = htmlspecialchars($room->name);
-		$desc = htmlspecialchars($room->description);
+		$desc = $room->description ? htmlspecialchars($room->description) : "";
 		$users = htmlspecialchars($room->active_users);
 		$preview_link = htmlspecialchars($room->preview_link);
 		$join_link = htmlspecialchars($room->join_link);