Do not die miserably when you get `False` as the HTML input. Test it.

html_text/models/ir_fields_converter.py

@@ -41,7 +41,7 @@ class IrFieldsConverter(models.Model):
         # Parse HTML
         try:
             doc = html.fromstring(html_content)
-        except (etree.XMLSyntaxError, etree.ParserError):
+        except (TypeError, etree.XMLSyntaxError, etree.ParserError):
             if fail:
                 raise
             else:

html_text/tests/test_extractor.py

@@ -46,6 +46,12 @@ class ExtractorCase(TransactionCase):
         with self.assertRaises(etree.XMLSyntaxError):
             self.text_from_html("", fail=True)
 
+    def test_false_html(self):
+        """``False`` HTML handled correctly."""
+        self.assertEqual(self.text_from_html(False), "")
+        with self.assertRaises(TypeError):
+            self.text_from_html(False, fail=True)
+
     def test_bad_html(self):
         """Bad HTML handled correctly."""
         self.assertEqual(self.text_from_html("<<bad>"), "")