FileContentProvider: fix crash on certain upgrades

checkIfColumnExists should not use getColumnIndexOrThrow, as it's supposed to check if the index doesn't exist

Signed-off-by: Álvaro Brey Vilas <alvaro.brey@nextcloud.com>

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

@@ -722,7 +722,7 @@ public class FileContentProvider extends ContentProvider {
 
     private boolean checkIfColumnExists(SQLiteDatabase database, String table, String column) {
         Cursor cursor = database.rawQuery("SELECT * FROM " + table + " LIMIT 0", null);
-        boolean exists = cursor.getColumnIndexOrThrow(column) != -1;
+        boolean exists = cursor.getColumnIndex(column) != -1;
         cursor.close();
 
         return exists;