disable collector correctly

src/cfg/cfg.go

@@ -46,9 +46,6 @@ func (settings *AppSettings) validateFlags() {
 				minServerPort, maxServerPort, settings.MetricsPort)
 			flagsValid = false
 		}
-		if settings.FileCollectorPath != "" {
-			settings.FileCollectorEnabled = true
-		}
 		if settings.FileCollectorEnabled && settings.FileCollectorPath == "" {
 			fmt.Printf("file collector directory path must not be empty if collector enabled\n")
 			flagsValid = false

src/textfile/writer.go

@@ -9,6 +9,10 @@ import (
 )
 
 func (c *Collector) WriteTextFileMetrics(w http.ResponseWriter, r *http.Request) {
+	if !c.enabled {
+		return
+	}
+
 	files, err := ioutil.ReadDir(c.folderPath)
 	if err != nil {
 		c.appendErrorForPath(c.folderPath)