[data] DSS.map: more appropriate default of tqdm kwargs

data.py

@@ -58,7 +58,7 @@ class SKDict(dict):
     def copy(self):
         return self.__class__(self)
 
-    def map(self, func, groups=None, prog=False):
+    def map(self, func, groups=None, prog={}):
         if groups is None:
             groups = self.keys()
         wrap = lambda x: tqdm(x, **prog) if prog else lambda x: x