Use `*spec.SenderID` for `QuerySenderIDForUser` (#3164)

There are cases where a dendrite instance is unaware of a pseudo ID for
a user, the user is not a member of that room. To represent this case,
we currently use the 'zero' value, which is often not checked and so
causes errors later down the line. To make this case more explict, and
to be consistent with `QueryUserIDForSender`, this PR changes this to
use a pointer (and `nil` to mean no sender ID).

Signed-off-by: `Sam Wedgwood <sam@wedgwood.dev>`

1 files changed, 10 insertions, 4 deletions

diff --git a/go.sum b/go.sum
index 28c60df4..779c2861 100644
--- a/go.sum
+++ b/go.sum
@@ -113,6 +113,7 @@ github.com/glycerine/go-unsnap-stream v0.0.0-20180323001048-9f0cb55181dd/go.mod
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@@ -175,12 +176,14 @@ github.com/h2non/filetype v1.1.3/go.mod h1:319b3zT68BvV+WRj7cwy856M2ehB3HqNOt6sy
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@@ -207,8 +210,10 @@ github.com/matrix-org/go-sqlite3-js v0.0.0-20220419092513-28aa791a1c91 h1:s7fexw
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@@ -241,6 +246,7 @@ github.com/morikuni/aec v1.0.0/go.mod h1:BbKIizmSmc5MMPqRYbxO4ZU0S0+P200+tUnFx7P
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@@ -322,8 +328,8 @@ github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO
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