logging issue

[adrien-berchet]

Since 1.7.13 the library fails at converting some nested types like tuple just because of the internal logger.
For example, this fails:

dicttoxml({"a": 1, "b": (1, 2)})

Just because this line fails:

LOG.info('Inside unicode_me(). val = "%s"' % (val))

[adrien-berchet]

BTW, this kind of issue would be easily spotted by unit tests ;-)
I can open a PR to clean this a bit if you need.

[quandyfactory]

Thank you - this issue is resolved with version 1.7.16.