Changing theme on bible settings tab causes an error when saving service

Similar to the bug "Adding notes to service causes error on save" https://bugs.launchpad.net/openlp/+bug/1216785

I have not been able to reproduce it, but it appears adding a theme (possibly to a bible) causes a traceback on save. An example:

*OpenLP Bug Report*Version: {u'full': u'2.0.3', u'version': u'2.0.3',
u'build': None}--- Details of the Exception. ---Saving service:
16.11.13 --- Exception Traceback ---Traceback (most recent call last):
File D:\OpenLP_Code\2.0\build\pyi.win32\OpenLP\out00-PYZ.pyz\openlp.core.ui.servicemanager,
line 473, in saveFile File
D:\OpenLP_Code\2.0\build\pyi.win32\OpenLP\out00-PYZ.pyz\openlp.core.ui.servicemanager,
line 647, in saveFileAs File
D:\OpenLP_Code\2.0\build\pyi.win32\OpenLP\out00-PYZ.pyz\openlp.core.ui.servicemanager,
line 546, in saveFile File
D:\OpenLP_Code\2.0\build\pyi.win32\OpenLP\out00-PYZ.pyz\json, line
231, in dumps File
D:\OpenLP_Code\2.0\build\pyi.win32\OpenLP\out00-PYZ.pyz\json.encoder,
line 201, in encode File
D:\OpenLP_Code\2.0\build\pyi.win32\OpenLP\out00-PYZ.pyz\json.encoder,
line 264, in iterencode File
D:\OpenLP_Code\2.0\build\pyi.win32\OpenLP\out00-PYZ.pyz\json.encoder,
line 178, in defaultTypeError: PyQt4.QtCore.QString(u'Blue Burst') is
not JSON serializable--- System information ---Platform:
Windows-7-6.1.7601-SP1--- Library Versions ---Python: 2.7.3Qt4:
4.8.3Phonon: 4.4.0PyQt4: 4.9.5QtWebkit: 534.34SQLAlchemy:
0.7.7SQLAlchemy Migrate: 0.7.2BeautifulSoup: 3.2.1lxml: 2.3.0Chardet:
1.0.1PyEnchant: 1.6.5PySQLite: 1.0.1Mako: 0.7.0pyUNO bridge: -

See:
http://support.openlp.org/issues/2143
http://support.openlp.org/issues/2142
http://support.openlp.org/issues/2134
http://support.openlp.org/issues/2133
http://support.openlp.org/issues/2114