Bug fix: Deleting from empty map.

Signed-off-by: thatInfrastructureGuy <thatInfrastructureGuy@gmail.com>

handlers/cache.go

@@ -1,10 +1,11 @@
 package handlers
 
 import (
-	"github.com/statping/statping/utils"
 	"net/url"
 	"sync"
 	"time"
+
+	"github.com/statping/statping/utils"
 )
 
 var CacheStorage Cacher
@@ -90,8 +91,8 @@ func (s Storage) List() map[string]Item {
 //Get a cached content by key
 func (s Storage) Get(key string) []byte {
 	item := s.items[key]
-	if s.items[key].Expired() {
-		CacheStorage.Delete(key)
+	if item.Expired() {
+		s.Delete(key)
 		return nil
 	}
 	return item.Content