Import xmpp in jingle_content, so that JingleContent.__content can work. fixes #5524

src/common/jingle_content.py

@@ -15,6 +15,8 @@
 Handles Jingle contents (XEP 0166)
 """
 
+import xmpp
+
 contents = {}
 
 def get_jingle_content(node):
@@ -131,4 +133,4 @@ class JingleContent(object):
 		self.callbacks = None
 		del self.session.contents[(self.creator, self.name)]
 
-# vim: se ts=3:
\ No newline at end of file
+# vim: se ts=3: