Nothing to see here at this convention. Just like the republicans, it is an election and there are opposition candidates. Some of each stuck with their candidate. So what, that is how elections work.
The party bosses had their own ideas of who they wanted in, no surprises there from democrats or republicans. The DNC email dump is a bunch of white noise. Election hoo-rah. The emails that count are the ones she deleted from her State Department job, ie "Hello House of Saud, here are your jets and bombs to kill Yemenis, have the money in the Clinton Foundation by 5 pm. Thx."
Kind of a formality on Hillary's side, she has been the presumptive nominee for well over a year. Nobody would run against her. So frumpy old Bernie, the socialist standard bearer does a token cameo performance. He was sick of emails before the debates even started. He steered clear of her awful Secretary of State record - such an easy target - and capitulated in the end, endorsing her.
So finally we get to see an actual contest for Hillary. Trump cleaned the republican's clocks in his primary. The problem with a coronation, with Bernie not challenging the emails, the Clinton foundation, Bill's sexual assaults and Hillary's victimization of the women afterwards - she has not fielded any defense to what Trump will rain down upon her.