config: do not handle "" durations (and do not error)

They should not be interpreted as 0, since that may overwrite
defaults which are not 0. We simply need to do nothing.

License: MIT
Signed-off-by: Hector Sanjuan <code@hector.link>

config/util.go

@@ -97,7 +97,8 @@ type DurationOpt struct {
 func ParseDurations(component string, args ...*DurationOpt) error {
 	for _, arg := range args {
 		if arg.Duration == "" {
-			*arg.Dst = 0
+			// don't do anything. Let the destination field
+			// stay at its default.
 			continue
 		}
 		t, err := time.ParseDuration(arg.Duration)