#206 errors is wrong type in restructuredtext.py

[Alan Trick]

In markup/restructuredtext.py the _SplitFieldsTranslator is created with the instance variable set to None. It should be a list and this causes it to die* when it tries to append an error message later on.

The fix is simple, on line 166, change errors=None to errors=[]

* the exact exception is: AttributeError: 'NoneType' object has no attribute 'append'

[Daniele Varrazzo]

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Fixed in r1596