Revert "drop: debug."

This reverts commit 7d48ea1bca.

resources/prosody-plugins/mod_filter_iq_rayo.lua

@@ -145,7 +145,7 @@ module:hook("pre-iq/full", function(event)
                 dial:tag("header", {
                     xmlns = "urn:xmpp:rayo:1",
                     name = OUT_INITIATOR_USER_ATTR_NAME,
-                    value = user_id });
+                    value = tostring(user_id)});
                 dial:up();
 
                 -- Add the initiator group information if it is present
@@ -153,7 +153,7 @@ module:hook("pre-iq/full", function(event)
                     dial:tag("header", {
                         xmlns = "urn:xmpp:rayo:1",
                         name = OUT_INITIATOR_GROUP_ATTR_NAME,
-                        value = session.jitsi_meet_context_group });
+                        value = tostring(session.jitsi_meet_context_group) });
                     dial:up();
                 end
             end

resources/prosody-plugins/util.lib.lua

@@ -321,8 +321,11 @@ function starts_with_one_of(str, prefixes)
     return false
 end
 
-
 function ends_with(str, ending)
+    if not str then
+        return false;
+    end
+
     return ending == "" or str:sub(-#ending) == ending
 end