Update ineptepub.py

Handle uncompressed elements (if any) in the zip file.

DeDRM_plugin/ineptepub.py

@@ -353,11 +353,15 @@ class Decryptor(object):
 
     def decompress(self, bytes):
         dc = zlib.decompressobj(-15)
-        bytes = dc.decompress(bytes)
+        try:
+            decompressed_bytes = dc.decompress(bytes)
             ex = dc.decompress(b'Z') + dc.flush()
             if ex:
-            bytes = bytes + ex
+                decompressed_bytes = decompressed_bytes + ex
+        except:
+            # possibly not compressed by zip - just return bytes
             return bytes
+        return decompressed_bytes 
     
     def decrypt(self, path, data):
         if path.encode('utf-8') in self._encrypted: