Optimized locks in Cache

Core/Cache.cs

@@ -22,13 +22,12 @@ namespace FLocal.Core {
 					}
 				}
 			}
-			lock(id) {
-				if(this.cache.ContainsKey(id)) {
+			try {
  				return this.cache[id];
-				}
-			}
+			} catch(KeyNotFoundException) {
 				return this.get(id, getter);
 			}
+		}
 
 		public void delete(object id) {
 			lock(id) {