ts_31_102.py: EF_SUCI_Calc_Info(TransparentEF): fix len test

while len(foo):

throws an exception when foo == None.
Instead doing

    while foo:

fixes a problem when reading in empty SUCI calc info data, e.g. from
TS48v7.0_SAIP2.3_BERTLV_SUCI_NoRAMRFM.der.

Change-Id: Ia4e2356d0241d7a6ca399ba7e8be7f27ec836104

pySim/ts_31_102.py

@@ -327,7 +327,7 @@ class EF_SUCI_Calc_Info(TransparentEF):
         """conversion method to generate list of {hnet_pubkey_identifier, hnet_pubkey} dicts
         from flat [{hnet_pubkey_identifier: }, {net_pubkey: }, ...] list"""
         out = []
-        while len(l):
+        while l:
             a = l.pop(0)
             b = l.pop(0)
             z = {**a, **b}