Improved ShortcutManagerTestUtils. getDefaultLauncher() in case of error.

Test: atest CtsDevicePolicyManagerTestCases:com.android.cts.devicepolicy.MixedDeviceOwnerTest#testSuspendPackage,testSuspendPackageWithPackageManager
Bug: 182387060

Change-Id: I688dfbbf47aea000b2130324fc278ef914513563
1 file changed