Update matplotlib_table.py

refer to #117

dataframe_image/converter/matplotlib_table.py

@@ -144,7 +144,7 @@ def parse_row(row):
             for row in tbody.findall(".//tr"):
                 rows.append(parse_row(row))
 
-        if not thead and not tbody:
+        if not len(thead) and not len(tbody):
             for row in tree.findall(".//tr"):
                 rows.append(parse_row(row))