refactor(directories): improve error handling

src/main/java/com/ddf/vodsystem/exceptions/StorageException.java

@@ -0,0 +1,8 @@
+package com.ddf.vodsystem.exceptions;
+
+public class StorageException extends RuntimeException {
+    public StorageException(String message) {
+        super(message);
+    }
+    public StorageException(String message, Throwable cause) { super(message, cause); }
+}