Prevent index Error if no template in leadsec

Check if there is a template in leadsec before accessing list item to
prevent IndexErrors

Related Task: [https://fs.golderweb.de/index.php?do=details&task_id=115 FS#115]

bots/markpages.py

@@ -214,11 +214,12 @@ class MarkPagesBot( CurrentPageBot ):  # sets 'current_page' on each treat()
         # There is none on empty pages, so we need to check
         if leadsec:
             # Get the last template in leadsec
-            ltemplate = leadsec.filter_templates()[-1]
+            ltemplates = leadsec.filter_templates()
 
             # If there is one, add notice after this
-            if ltemplate:
-                self.current_wikicode.insert_after(ltemplate, self.disc_notice)
+            if ltemplates:
+                self.current_wikicode.insert_after( ltemplates[-1],
+                                                    self.disc_notice )
 
                 # To have it in its own line we need to add a linbreak before
                 self.current_wikicode.insert_before(self.disc_notice, "\n" )