Donald Trump’s own request for discovery led to “some gems” for the team of prosecutors charging him with a hush money cover-up case, a legal expert said Sunday. MSNCB legal analyst Lisa Rubin flagged the observation over the weekend, noting that, while the “Trump trial will resume tomorrow morning,” the expert sought “to share an observation from my review of exhibits shown to Hope Hicks.” “Several of Hicks’s communications from the campaign — including the ones below with & about the WSJ regarding Karen McDougal — were initially produced to the feds by the Trump ‘16 campaign,” Rubin explaine…