fix initialization of storage manager collection

Signed-off-by: Jens Mueller <tschenser@gmx.de>

src/main/java/com/owncloud/android/providers/DocumentsStorageProvider.java

@@ -118,6 +118,10 @@ public class DocumentsStorageProvider extends DocumentsProvider {
     @Override
     public Cursor queryRoots(String[] projection) {
 
+        // always recreate storage manager collection, as it will change after account creation/removal
+        // and we need to serve document(tree)s with persist permissions
+        initiateStorageMap();
+
         Context context = MainApp.getAppContext();
         AppPreferences preferences = AppPreferencesImpl.fromContext(context);
         if (SettingsActivity.LOCK_PASSCODE.equals(preferences.getLockPreference()) ||
@@ -125,8 +129,6 @@ public class DocumentsStorageProvider extends DocumentsProvider {
             return new FileCursor();
         }
 
-        initiateStorageMap();
-
         final RootCursor result = new RootCursor(projection);
         for(int i = 0; i < rootIdToStorageManager.size(); i++) {
             result.addRoot(new Document(rootIdToStorageManager.valueAt(i), ROOT_PATH), getContext());
@@ -293,6 +295,11 @@ public class DocumentsStorageProvider extends DocumentsProvider {
     @Override
     public boolean onCreate() {
         accountManager = UserAccountManagerImpl.fromContext(getContext());
+
+        // initiate storage manager collection, because we need to serve document(tree)s
+        // with persist permissions
+        initiateStorageMap();
+
         return true;
     }