Prevent errors when someone abandons a call to conference center before providing a pin number.

includes/install/scripts/app/conference_center/index.lua

@@ -147,6 +147,7 @@
 			dbh = freeswitch.Dbh(database["system"]);
 
 		--get the conference sessions
+			if (conference_session_uuid) then
 				sql = [[SELECT count(*) as num_rows 
 					FROM v_conference_sessions
 					WHERE conference_session_uuid = ']] .. conference_session_uuid ..[[']];
@@ -188,8 +189,10 @@
 					dbh:query(SQL_STRING);
 					freeswitch.consoleLog("notice", "[conference] SQL: " .. SQL_STRING .. "\n");
 				end
+			end
 
 		--add the conference sessions details
+			if (conference_session_uuid) then
 				local sql = {}
 				table.insert(sql, "INSERT INTO v_conference_session_details ");
 				table.insert(sql, "(");
@@ -227,8 +230,10 @@
 				table.insert(sql, ") ");
 				SQL_STRING = table.concat(sql, "\n");
 				dbh:query(SQL_STRING);
+			end
 
 		--if the conference is empty
+			if (conference_session_uuid) then
 				cmd = "conference "..meeting_uuid.."-"..domain_name.." xml_list";
 				result = trim(api:executeString(cmd));
 				if (string.sub(result, -9) == "not found") then
@@ -290,10 +295,13 @@
 							end
 						end);
 				end
+			end
 
 		--close the database connection
+			if (conference_session_uuid) then
 				dbh:release();
 			end
+	end
 
 --make sure the session is ready
 	if (session:ready()) then
@@ -433,7 +441,9 @@
 			dbh:release();
 
 		--set the meeting uuid
+			if (meeting_uuid) then
 				session:setVariable("meeting_uuid", meeting_uuid);
+			end
 
 		if (conference_center_uuid == nil) then
 			--invalid pin number