CSW requests Unicode error

[tomkralidis]

from owslib.csw import CatalogueServiceWeb
from owslib.fes import PropertyIsEqualTo

csw = 'http://geoportal.gov.cz/php/micka/csw/index.php'
aopk_query = PropertyIsEqualTo('csw:MetadataContact', 'Agentura ochrany přírody a krajiny České republiky')
>>>> cenia.getrecords2([aopk_query])
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/local/lib/python2.7/dist-packages/owslib/csw.py", line 341, in
> getrecords2
>     node2.append(flt.setConstraintList(constraints))
>   File "/usr/local/lib/python2.7/dist-packages/owslib/fes.py", line 143, in
> setConstraintList
>     return self.setConstraint(constraints[0])
>   File "/usr/local/lib/python2.7/dist-packages/owslib/fes.py", line 117, in
> setConstraint
>     self._root.append(constraint.toXML())
>   File "/usr/local/lib/python2.7/dist-packages/owslib/fes.py", line 264, in
> toXML
>     etree.SubElement(node0, util.nspath_eval('ogc:Literal',
> namespaces)).text = self.literal
>   File "lxml.etree.pyx", line 953, in lxml.etree._Element.text.__set__
> (src/lxml/lxml.etree.c:45142)
>   File "apihelpers.pxi", line 684, in lxml.etree._setNodeText
> (src/lxml/lxml.etree.c:20505)
>   File "apihelpers.pxi", line 1393, in lxml.etree._utf8
> (src/lxml/lxml.etree.c:26656)
> ValueError: All strings must be XML compatible: Unicode or ASCII, no NULL
> bytes or control characters

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