Fix #2343

CHANGELOG

@@ -3,6 +3,11 @@ For more detailed changelog, see the roadmap:
 http://dev.louiz.org/projects/poezio/roadmap
 
 * Poezio 0.8 - dev
+- /invite in a MUCTab now has the behavior one could expect
+  (inviting a specific JID to this MUC)
+- Themes and plugins are now loaded using a set of paths instead
+  of only a specific directory.
+- The OTR plugin has been completly rewritten
 - The completion can now complete the current argument in the input,
   instead of only the last one.
 - Poezio now periodically pings the server to detect connection loss

src/theming.py

@@ -451,7 +451,7 @@ def reload_theme():
         log.error('Failed to load the theme %s', theme_name, exc_info=True)
         exc = e
     finally:
-        if version_info[1] < 3:
+        if version_info[1] < 3 and imp.lock_held():
             imp.release_lock()
 
     if not new_theme: