empty slice (initiated with []string) got serialized to null.

Changed to make([]string, 0) instead

Author: Peter Klaesson

server/commands/Df.go

@@ -14,7 +14,7 @@ func (command Command) Df() ([]string, error){
 
 func df() ([]string, error) {
 	settings := cfg.GetSettings()
-	rootNames := []string{}
+	rootNames := make([]string, 0)
 	for i := 0; i < len(settings.Roots); i++ {
 		rootNames = append(rootNames, settings.Roots[i].Name)
 	}

server/commands/Ls.go

@@ -19,7 +19,7 @@ func ls(directory string) ([]File, error) {
 	}
 
 	files, _ := ioutil.ReadDir(path)
-	var response []File
+	response := make([]File, 0)
 
 	for _, file := range files {
 		f := File{Name: file.Name(), Size: file.Size(), Modified: file.ModTime()}