Fix for restarting the disassembly when the disassembly hasn't yet re…

…ached the request to restart

omnivore/tasks/hex_edit/disassembly.py

@@ -41,7 +41,12 @@ def set_editor(self, editor):
         self.disassemble_next()
 
     def restart_disassembly(self, index):
-        next_row = self.index_to_row[index]
+        try:
+            next_row = self.index_to_row[index]
+        except IndexError:
+            # requesting an index that has yet to be disassembled, so it will
+            # get there when it gets there! Be patient!
+            return
 
         # don't reset starting point if the requested index is already in the
         # region to be rebuilt