formdef: allow empty <description/> tags on import (#17291)

tests/test_formdef_import.py

@@ -65,6 +65,16 @@ def test_text_attributes():
     f2 = assert_json_import_export_works(formdef)
     assert f2.url_name == formdef.url_name
 
+def test_empty_description_tag():
+    formdef = FormDef()
+    formdef.name = 'empty'
+    assert_xml_import_export_works(formdef)
+    export = ET.tostring(export_to_indented_xml(formdef))
+    # add empty description tag
+    export = export.replace(b'<name>empty</name>', b'<name>empty</name><description></description>')
+    formdef2 = FormDef.import_from_xml_tree(ET.fromstring(export))
+    assert not formdef2.description
+
 def test_boolean_attributes():
     formdef = FormDef()
     formdef.name = 'Foo'

wcs/formdef.py

@@ -1059,7 +1059,7 @@ class FormDef(StorableObject):
             formdef.id = tree.attrib.get('id')
         for text_attribute in list(cls.TEXT_ATTRIBUTES):
             value = tree.find(text_attribute)
-            if value is None:
+            if value is None or value.text is None:
                 continue
             setattr(formdef, text_attribute, force_str(value.text))