Report viewer when there is no protocol

[thomas-vincent]

With a fresh brainstorm installation and nothing in the DB, calling the Report Viewer leads to the following error:

---

** Error: Line 1062: Struct contents reference from a non-struct array object.
**
** Call stack:
** >bst_report.m>GetReport at 1062
** >bst_report.m>Open at 630
** >bst_report.m at 58
** >bst_call.m at 28
** >gui_brainstorm.m>@(h,ev)bst_call(@bst_report,'Open','current') at 124
**

---

After that a first protocol is created, it works.