Merge pull request #8 from DigitalSlideArchive/harden-diskcache

Harden diskcache in the mount command.

girder_client_mount/girder_client_mount.py

@@ -362,6 +362,7 @@ def read(self, path, size, offset, fh):
                         self.diskcache['cache'][key] = data
                     except Exception:
                         logger.exception('diskcache threw an exception in set')
+                if isinstance(data, bytes):
                     result += data[max(0, offset - idxoffset):
                                    min(len(data), offset + size - idxoffset)]
                 else: