Fallback to default storage dir when the currentPath doesn't exist.

Clover/app/src/main/java/org/floens/chan/ui/fragment/FolderPickFragment.java

@@ -19,6 +19,7 @@ package org.floens.chan.ui.fragment;
 
 import android.app.DialogFragment;
 import android.os.Bundle;
+import android.os.Environment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -135,6 +136,10 @@ public class FolderPickFragment extends DialogFragment {
 
         listView.setAdapter(adapter);
 
+        if (currentPath == null || !currentPath.exists()) {
+            currentPath = Environment.getExternalStorageDirectory();
+        }
+
         moveTo(currentPath);
 
         return container;