Assertion failure in consensus_cache_entry_handle_get on Windows

We've received a bug report on execdir@ with a bug in Tor 0.3.1.3-alpha (dc47d936d47ffc25).

The following log snippet was attached:

24 02:42:42.645 [Warning] Unable to unlink "S:/PortableApps/TorBrowser/Browser/TorBrowser/Data/Tor\\diff-cache/1011"
24 02:42:42.645 [Warning] tor_bug_occurred_(): Bug: consdiffmgr.c:1285: store_multiple: Non-fatal assertion !(ent == NULL) failed. (on Tor 0.3.1.3-alpha dc47d936d47ffc25)
24 02:42:42.645 [Warning] Bug: Non-fatal assertion !(ent == NULL) failed in store_multiple at consdiffmgr.c:1285. (Stack trace not available) (on Tor 0.3.1.3-alpha dc47d936d47ffc25)
24 02:47:50.583 [Error] tor_assertion_failed_(): Bug: conscache.c:521: consensus_cache_entry_handle_get: Assertion ref failed; aborting. (on Tor 0.3.1.3-alpha dc47d936d47ffc25)
24 02:47:50.583 [Error] Bug: Assertion ref failed in consensus_cache_entry_handle_get at conscache.c:521. (Stack trace not available) (on Tor 0.3.1.3-alpha dc47d936d47ffc25)

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