One less bundle required and easier to read assertions.

Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>

Change-Id: I18e816e11373368a135ac650a2d8af2bdc18da21
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.ui/+/192431
Tested-by: Platform Bot <platform-bot@eclipse.org>
Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>