apachedex: Simplify lzma detection code.

apachedex/__init__.py

@@ -80,7 +80,6 @@ def _wrapOpen(func):
     return srw
   return wrapper
 
-lzma = None
 gzip_open = gzip.open
 if sys.version_info >= (3, 3):
   import lzma
@@ -90,16 +89,15 @@ else:
   gzip_open = _wrapOpen(gzip_open)
   bz2_open = _wrapOpen(bz2.BZ2File)
   _read_mode = 'r'
+  try:
+    from backports import lzma
+  except ImportError:
+    lzma = None
 
 FILE_OPENER_LIST = [
   (gzip_open, IOError),
   (bz2_open, IOError),
 ]
-if lzma is None:
-  try:
-    from backports import lzma
-  except ImportError:
-    pass
 if lzma is not None:
   FILE_OPENER_LIST.append((lzma.open, lzma.LZMAError))