[MM-29731] Fix panic in saveUserTermsOfService (#16044)

* Fix panic in saveUserTermsOfService

* Remove unneeded initialization

api4/user_test.go

@@ -828,6 +828,17 @@ func TestGetUserByUsernameWithAcceptedTermsOfService(t *testing.T) {
 	require.Equal(t, tos.Id, ruser.TermsOfServiceId, "Terms of service ID should match")
 }
 
+func TestSaveUserTermsOfService(t *testing.T) {
+	th := Setup(t)
+	defer th.TearDown()
+
+	t.Run("Invalid data", func(t *testing.T) {
+		resp, err := th.Client.DoApiPost("/users/"+th.BasicUser.Id+"/terms_of_service", "{}")
+		require.NotNil(t, err)
+		assert.Equal(t, http.StatusBadRequest, resp.StatusCode)
+	})
+}
+
 func TestGetUserByEmail(t *testing.T) {
 	th := Setup(t)
 	defer th.TearDown()