Allow default schedule items to be skipped by setting to 'null'

lib/App/Netdisco/Backend/Role/Scheduler.pm

@@ -20,7 +20,8 @@ sub worker_begin {
   debug "entering Scheduler ($wid) worker_begin()";
 
   foreach my $action (keys %{ setting('schedule') }) {
-      my $config = setting('schedule')->{$action};
+      my $config = setting('schedule')->{$action}
+        or next;
 
       # accept either single crontab format, or individual time fields
       $config->{when} = Algorithm::Cron->new(
@@ -59,7 +60,8 @@ sub worker_body {
 
       # if any job is due, add it to the queue
       foreach my $action (keys %{ setting('schedule') }) {
-          my $sched = setting('schedule')->{$action};
+          my $sched = setting('schedule')->{$action}
+            or next;
 
           # next occurence of job must be in this minute's window
           debug sprintf "sched ($wid): $action: win_start: %s, win_end: %s, next: %s",

lib/App/Netdisco/Worker/Plugin/DumpConfig.pm

@@ -0,0 +1,18 @@
+package App::Netdisco::Worker::Plugin::DumpConfig;
+
+use Dancer ':syntax';
+use App::Netdisco::Worker::Plugin;
+use aliased 'App::Netdisco::Worker::Status';
+
+use Data::Printer;
+
+register_worker({ phase => 'main' }, sub {
+  my ($job, $workerconf) = @_;
+  my $extra = $job->extra;
+
+  my $config = config();
+  p ($extra ? $config->{$extra} : $config);
+  return Status->done('Dumped config');
+});
+
+true;