Do not handle Tags as list in envirnoment table

Author: werdeil

pytest_html/plugin.py

@@ -25,7 +25,7 @@
     # ansi2html is not installed
     ANSI = False
 
-from py.xml import html, raw
+from py.xml import html, raw, Tag
 
 from . import extras
 from . import __version__, __pypi_url__
@@ -571,7 +571,7 @@ def _generate_environment(self, config):
             value = metadata[key]
             if isinstance(value, str) and value.startswith("http"):
                 value = html.a(value, href=value, target="_blank")
-            elif isinstance(value, (list, tuple, set)):
+            elif isinstance(value, (list, tuple, set)) and not isinstance(value, Tag):
                 value = ", ".join(str(i) for i in sorted(map(str, value)))
             elif isinstance(value, dict):
                 sorted_dict = {k: value[k] for k in sorted(value)}