fixed segfaults caused by preset_hub_read and preset_hub_readpreset (may want...

fixed segfaults caused by preset_hub_read and preset_hub_readpreset (may want to revisit later to disable the crflag from the binbuf_read_via_canvas and consider implications of potentially running into an A_SEMI which currently does not appear to be likely, or dare I say, possible?) This also solves the bug where the two actions misreport successful operation completion.