The cacheDir property should always be set
Description
Upon first download, cacheDir is None, but the second time you do a syn.get on it, the cacheDir is set.
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In [331]: e = syn.get("syn7829545")
Downloading [####################]100.00% 6.0kB/6.0kB (2.4MB/s) mm_predictions_out.zip Done...
In [332]: e.cacheDir
In [333]: e = syn.get("syn7829545")
In [334]: e.cacheDir
Out[334]: u'/Users/ThomasY/.synapseCache/323/14131323'