[libbeat] Input reload: do not log error if error is nil (#47422)

(cherry picked from commit 9c4239e)

Author: belimawr

libbeat/cfgfile/reload.go

@@ -220,7 +220,9 @@ func (rl *Reloader) Run(runnerFactory RunnerFactory) {
 			if forceReload {
 				rl.logger.Debugf("error '%v' can be retried. Will try again in %s", err, rl.config.Reload.Period.String())
 			} else {
-				rl.logger.Debugf("error '%v' cannot retried. Modify any input file to reload.", err)
+				if err != nil {
+					rl.logger.Debugf("error '%v' cannot retried. Modify any input file to reload.", err)
+				}
 			}
 		}