bigDataStorage: Fix a TypeError when read is called with None

diff --git a/Cura/util/bigDataStorage.py b/Cura/util/bigDataStorage.py
index 9150455cad8c6b19d9445cfc39a6b13f434c5f6b..7b469cf355b3939f0e281290fdefbbced2c69dd9 100644 (file)
--- a/Cura/util/bigDataStorage.py
+++ b/Cura/util/bigDataStorage.py
@@ -21,7 +21,7 @@ class BigDataStorage(object):
                self._active.seek(0)\r
                self._read_index = 0\r
 \r
-       def read(self, size=None):\r
+       def read(self, size=-1):\r
                ret = self._active.read(size)\r
                if ret == '':\r
                        if self._read_index + 1 < len(self._list):\r
@@ -78,4 +78,4 @@ class BigDataStorage(object):
                for item in self._list:\r
                        clone._list.append(StringIO.StringIO(item.getvalue()))\r
                clone._active = clone._list[-1]\r
-               return clone
\ No newline at end of file
+               return clone\r