XML Export of transactions to GDrive generates broken XML since latest version #686

Steps to reproduce the behaviour

1. Transactions->Export

2. Save As... (file in Google Drive), Format XML

3. Export

4. Open...

5. Choose file from Google Drive
   => 'An error occurred while importing the GnuCash accounts At line 1, column 2: not well-formed (invalid token)'

Expected behaviour

Export and Open works, as before the latest update.

Actual behaviour

• The resulting exported XML files seems to be much smaller, than before.
• Import results in complaints, that the file is invalid:
  => 'An error occurred while importing the GnuCash accounts At line 1, column 2: not well-formed (invalid token)'

Software specifications

• GnuCash Android version:2.2.0 (May 3, 2017)
• System Android version: 6.0.1
• Device type: Samsung Galaxy Note 4 (N910FXXS1DQA1)