Use the user cache when domain group retreival fails at any stage #194
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Previously, in cases where the domain could be reached but groups could not be queried, RAWeb silently failed and then used a list of empty groups for the user's domain group membership. When this happens, we should be falling back to use user cache, which contains the correct (albeit stale) list of group memberships for the user from the time of their sign in.
Discovered as part of #190.