StorageService-backed RelayState mechanism did not return a state value.

[Dan McLaughlin]

We recently moved to SP 3.0.2, we tested fine in our test environment,
but after moving into production where we have a much larger user base
we started seeing the following error in logs.  It also seems as if
users are losing their login session because of it.  Still debugging,
but I thought I'd send this out in case anyone else has seen this.

2018-11-19 12:47:30 ERROR Shibboleth.SSO.SAML2 [9416] shib_handler
[default]: StorageService-backed RelayState mechanism did not return a
state value.


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Thanks,

Dan