DRIVERS-1593: test.operations array may be empty (#1709)

Author: jmikola

source/unified-test-format/tests/valid-pass/operation-empty_array.json

@@ -0,0 +1,7 @@
+description: "operation-empty_array"
+
+schemaVersion: "1.0"
+
+tests:
+  - description: "Empty operations array"
+    operations: []

source/unified-test-format/tests/valid-pass/operation-empty_array.yml

@@ -775,8 +775,7 @@ The structure of this object is as follows:
 
 <span id="test_operations"></span>
 
-- `operations`: Required array of one or more [operation](#operation) objects. List of operations to be executed for the
-    test case.
+- `operations`: Required array of [operation](#operation) objects. List of operations to be executed for the test case.
 
 <span id="test_expectEvents"></span>
 
@@ -3551,6 +3550,8 @@ other specs *and* collating spec changes developed in parallel or during the sam
 
 ## Changelog
 
+- 2024-10-31: Test operations array may be empty.
+
 - 2024-10-29: List more examples of root-level documents
 
 - 2024-10-24: Document `namespace` option for `failCommand` fail point.