DRIVERS-3403 test empty tag set matches servers with no tags (#1899)

Author: kevinAlbs

source/server-selection/tests/server_selection/ReplicaSetWithPrimary/read/SecondaryPreferred_empty_tags.json

@@ -0,0 +1,27 @@
+# Attempt to select the secondary using an empty tag set. Expect empty tag set to match.
+# This is a regression test for RUST-2363.
+---
+topology_description:
+  type: ReplicaSetWithPrimary
+  servers:
+  - &1
+    address: a:27017
+    avg_rtt_ms: 5
+    type: RSPrimary
+    # No "tags".
+  - &2
+    address: b:27017
+    avg_rtt_ms: 5
+    type: RSSecondary
+    # No "tags"
+operation: read
+read_preference:
+  mode: SecondaryPreferred
+  tag_sets:
+  - data_center: nyc # Does not match.
+  - {} # Empty tag set.
+suitable_servers:
+- *2
+in_latency_window:
+- *2
+