Handle optional TimeoutError attributes
#85
Merged
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In dask/distributed#9140 we are seeing a problem in our CI with newer versions of
tblib.It looks like this was partially fixed in #83 but the same applies to other attributes of
OSErrorsubclasses likeTimeoutError, e.gerrornoandstrerror. If the value of them isNonethey should not be set at all otherwise it will break the string representation.