TT#72163 - Fix 500 error on recorded streams

* Add check wether recording stream actually
	   exists, to prevent throwing error in case
	   there's a DB entry for the stream, but no
	   actual file is saved

Change-Id: Ibd051496f570f05ca7067dcaa9f2f9e85e5d84d6
(cherry picked from commit 574857cdec)

lib/NGCP/Panel/Controller/Subscriber.pm

@@ -4131,6 +4131,16 @@ sub play_stream :Chained('recording_stream') :PathPart('play') :Args(0) {
 
     # TODO: fix to be able to select certain stream
     my $stream = $c->stash->{stream};
+    unless (-e $stream->full_filename) {
+        NGCP::Panel::Utils::Message::error(
+            c     => $c,
+            log   => "no such recording file for stream with id ".$stream->id,
+            desc  => $c->loc('No such recording file'),
+        );
+        $c->response->redirect($c->uri_for_action('/subscriber/details', [$c->req->captures->[0]]));
+        $c->detach;
+        return;
+    }
     my $data = read_file($stream->full_filename);
     my $mime_type;
     if($stream->file_format eq "wav") {