Commits on Aug 15, 2018

1. Fix for nullptr deref when producers are waiting …

   #4972 created a different calling path into `producer_plugin_impl::calculate_next_block_time` where there was no pending block state.  As a result when the following conditions were met the code would dereference a null ptr:
   
   * the node was a producer, who _had_ produced during this processes lifetime OR replayed a block where they produced (so they have watermark data)
   * still in the active schedule of producers
   * experienced a gap in blocks of > 5 seconds (so they moved to our “waiting” mode)
   
   Credit goes to @heifner for the find

   

   b1bart committed Aug 15, 2018
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