Return empty dictionary when file has no properties #178
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Fix #89: properties method failed when no props defined
When a file has no properties, the xml doesn't contain 'target' and
target_elem is None. To conform to the documentation for properties,
return an empty dict (instead of None).
Test for both no properties and mime type property (writing a binary
file in the simplest way I can find).
Ran tests with nose2 on WSL and all passed.