Small fix for systems (i.e. my 12.04 LTS) that don't set LANGUAGE for whatever reason. This breaks the manual lookup

terminatorlib/util.py

@@ -87,6 +87,7 @@ def has_ancestor(widget, wtype):
 def manual_lookup():
     '''Choose the manual to open based on LANGUAGE'''
     prefix = os.path.join(os.sep, 'usr', 'share', 'doc', 'terminator')
+    if 'LANGUAGE' in os.environ:
         languages = os.environ['LANGUAGE'].split(':')
         for language in languages:
             full_path = os.path.join(prefix, 'html_%s' % (language), 'index.html')