Merged in NRRPLT-8105-adding-husky-robot-model-to- (pull request #115)

[NRRPLT-8105] Force encoding of lxml tostring method in order to return a string instead of bytes.

Approved-by: Krzysztof Lebioda
Approved-by: Antoine Detailleur

hbp_nrp_commons/hbp_nrp_commons/sim_config/ConfigEditor.py

@@ -222,7 +222,11 @@ class ConfigEditor(object):  # pragma: no cover
 
         # pylint: disable=no-self-use
         import lxml
-        return lxml.etree.tostring(lxml.etree.XML(plain_text), pretty_print=True)
+        return lxml.etree.tostring(
+            lxml.etree.XML(plain_text),
+            pretty_print=True,
+            encoding='unicode'
+        )
 
     def _write_xml(self, plain_text, filename):
         """