config: Fix server.redirects.fromRe being ignored unless server.redirects.from is also set

Author: p-weston

config/commonConfig.go

@@ -450,7 +450,7 @@ func (c *CacheBuster) CompileConfig(logger loggers.Logger) error {
 }
 
 func (r Redirect) IsZero() bool {
-	return r.From == ""
+	return r.From == "" && r.FromRe == ""
 }
 
 const (