You can try cursor.getCount() before cursor.moveToFirst().
>From javaDoc:
public abstract int getCount ()
Since: API Level 1 <../../../guide/appendix/api-levels.html#level1>

Returns the numbers of rows in the cursor.
 Returns

   - the number of rows in the cursor.

If getCount() is 0 that mean your cursor is empty.

Hope this helps!

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