New media scanner: only use with valid path

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

src/main/java/com/owncloud/android/datamodel/FileDataStorageManager.java

@@ -1718,7 +1718,7 @@ public class FileDataStorageManager {
         if (path != null) {
             ContentValues values = new ContentValues();
             ContentResolver contentResolver = MainApp.getAppContext().getContentResolver();
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && !TextUtils.isEmpty(path)) {
                 if (file != null) {
                     values.put(MediaStore.Images.Media.MIME_TYPE, file.getMimeType());
                     values.put(MediaStore.Images.Media.TITLE, file.getFileName());