Dear Maintainer,

I'm on Debian trixie, but had other reason to allow testing packages
(pinned to not auto-install/upgrade).  Due to wsdd having been removed
for trixie release the system then picked up the testing version.

In this version I see this logged:

2025-10-13T10:17:11.990915+01:00 emilia gvfsd[398794]: /usr/bin/wsdd:649: DeprecationWarning: Testing an element's truth value will always return True in future versions.  Use specific 'len(elem)' or 'elem is not None' test instead.

which is from this section of code:

 646             elif dialect == WSDP_URI + '/Relationship':
 647                 host_xpath = 'wsdp:Relationship[@Type="{}/host"]/wsdp:Host'     .format(WSDP_URI)
 648                 host_sec = section.find(host_xpath, namespaces)
 649                 if (host_sec):
 650                     self.extract_host_props(host_sec)
 651             else:
 652                 logger.debug('unknown metadata dialect ({})'.format(dialect     ))

So, presumably `if (host_sec):` needs changing to `if host_sec is not
None:` or similar.  Actually, I'm wondering why there are () on the
current version, perhaps those just need stripping ?
  Obviously it currently works well enough, but will need correcting for
whatever future Python version changes the behaviour.

  I've now checked upstream, and it looks like the adjustment has
already been made.  So, whenever the Debian maintainer updates to wsdd
0.9 this should be moot.

Hi,

I've improved the error message for this issue as described in the bug
report.

When parsed_format is List[X] but source_format is Y (not List[Y]),
the error message now clearly shows the type mismatch and explains
that source_format must also use List[].

This makes it much easier for plugin developers to understand and fix
the issue when they accidentally forget to wrap source_format in List[].

The patch is attached.

Thanks,
Abhinay Thorat