Porting #5277 - Do not process boost if no items to process

CHANGELOG

@@ -58,6 +58,7 @@ Cacti CHANGELOG
 -feature: Upgrade d3.js to version 7.8.2
 
 1.2.25
+-issue#5277: Boost should not attempt to start if there are no poller_output_boost records
 -issue#5279: Rebuild poller cache does not work as expected
 -issue#5282: Script ss_host_cpu.php does not work as expected when on a remote data collector with hmib enabled
 -issue#5283: Trying to access array offset on value of type null in file lib/functions.php on line: 2276

poller_boost.php

@@ -146,6 +146,15 @@
 	$run_now = boost_time_to_run($forcerun, $current_time, $last_run_time, $next_run_time);
 
 	if ($run_now) {
+		/**
+		 * Check to see if there are any poller items to process and if not
+		 * exit cleanly
+		 */
+		$poller_items = db_fetch_cell('SELECT * FROM poller_output_boost LIMIT 1');
+		if ($poller_items == 0) {
+			exit(0);
+		}
+
 		/* we will warn if the process is taking extra long */
 		if (!register_process_start('boost', 'master', $config['poller_id'], read_config_option('boost_rrd_update_max_runtime') * 3)) {
 			exit(0);