`notmuch2.errors` does not exist

Hi,

I just compiled notmuch2 bindings from source (using version 0.37) and notmuch2.errors does not exist.

It looks like the errors are exposed from the notmuch2 module:

>>> import notmuch2
>>> dir(notmuch2)
['AtomicContext', 'BinString', 'Database', 'DatabaseExistsError', 'DbRevision', 
'DuplicateMessageIdError', 'FileError', 'FileNotEmailError', 'IllegalArgumentError', 
'ImmutableTagSet', 'Message', 'MutableTagSet', 'NOTMUCH_TAG_MAX', 'NoConfigError',
 'NoDatabaseError', 'NotmuchError', 'NotmuchObject', 'NullPointerError', 'ObjectDestroyedError', 
'OutOfMemoryError', 'PathError', 'QuerySyntaxError', 'ReadOnlyDatabaseError', 
'TagTooLongError', 'TagsIter', 'Thread', 'UnbalancedAtomicError',
 'UnbalancedFreezeThawError', 'UnsupportedOperationError', 'UpgradeRequiredError',
 'XapianError', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__',
 '__package__', '__path__', '__spec__', '_base', '_config', '_database', '_errors', '_message', '_query', '_tags', '_thread', 'capi']

So, maybe this:

lieer/lieer/local.py

Line 638 in 72c298a

except notmuch2.errors.FileNotEmailError:

Should be changed from notmuch2.errors to just notmuch2?