fix(client): allow submitting empty multi-select answers

packages/client-runtime/src/state/pendingUserInput.test.ts

@@ -32,6 +32,19 @@ const nativeChoiceQuestion = {
 } as const;
 
 describe("resolvePendingUserInputAnswer", () => {
+  it("accepts no selections for multi-select questions while single-select stays unanswered", () => {
+    const question = { ...singleSelectQuestion, multiSelect: true };
+    expect(buildPendingUserInputAnswers([question], {})).toEqual({ scope: [] });
+    expect(resolvePendingUserInputAnswer(question, { selectedOptionValues: [] })).toEqual([]);
+    expect(resolvePendingUserInputAnswer(question, { customAnswer: "   " })).toEqual([]);
+    expect(resolvePendingUserInputAnswer(question, { customAnswer: "Something else" })).toBe(
+      "Something else",
+    );
+    expect(resolvePendingUserInputAnswer(question, { attachmentCount: 1 })).toBe("");
+    expect(resolvePendingUserInputAnswer(question, { attachmentsBlocked: true })).toBeNull();
+    expect(resolvePendingUserInputAnswer(singleSelectQuestion, undefined)).toBeNull();
+  });
+
   it("preserves exact editor text, including a deliberately cleared answer", () => {
     const question = { ...singleSelectQuestion, initialAnswer: "  Proposed message\n" };
     expect(resolvePendingUserInputAnswer(question, { customAnswer: question.initialAnswer })).toBe(
@@ -124,6 +137,11 @@ describe("togglePendingUserInputOptionSelection", () => {
     expect(buildPendingUserInputAnswers([question], { result: secondSelected })).toEqual({
       result: ["second"],
     });
+
+    const noneSelected = togglePendingUserInputOptionSelection(question, secondSelected, "second");
+    expect(buildPendingUserInputAnswers([question], { result: noneSelected })).toEqual({
+      result: [],
+    });
   });
 
   it("submits raw option values and leaves the draft alone for an unknown option", () => {

packages/client-runtime/src/state/pendingUserInput.ts

@@ -77,7 +77,9 @@ export function resolvePendingUserInputAnswer(
     return selectedOptionValues.length > 0
       ? selectedOptionValues
       : (customAnswer ??
-          (question.allowCustomAnswer !== false && (draft?.attachmentCount ?? 0) > 0 ? "" : null));
+          (question.allowCustomAnswer !== false && (draft?.attachmentCount ?? 0) > 0
+            ? ""
+            : selectedOptionValues));
   }
   return (
     selectedOptionValues[0] ??